Technical Catalogue
Ceiling Diffusers
Ceiling Diffusers are suitable for modular ceiling systems, heating, ventilating and cooling applications. Ceiling diffusers are efficient in handling high air volumes at a relatively low noise levels to offer an even disbursement of air. Multi-core diffusers are constructed from extruded Aluminium profiles/sheets. Available in a wide range of sizes in square and rectangular shapes a wide variety of air flow patterns can be achived to suit individual user`s needs.
Ceiling Diffusers
Ref: GD1000CD
EXCELAIR Air Outlets | Technical Catalogue
Diffusers are used in all HVAC systems as an integral part of room air distribution sub – systems.
High level of comfort in indoor air flow and higher performance level can be achieved.
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Enhances mixing of the room air with the primary air and discharge neatly executed.
Appropriate where low velocity air movement is indispensable.
Ceiling diffusers are efficient in handling high air volumes at a comparatively low noise levels to offer even disburse-ment of air.
Ceiling diffusers are intended to discharge the best possible directional performance. All our products are exceedingly versatile in design. Adjustable pattern models are available for pattern control from vertical projection to horizontal air circulation, adaptable for both variable air volume and constant air volume systems. Available in a wide range of sizes in both square and rectangular shapes.
Frames/Blades
Finish
Installation
Shape
Extruded aluminium alloy profile
Electrostatic polyester powder coated system/RAL code
Ceiling or duct mounting
Square and Rectangular
Ceiling Diffusers | Introduction
1
IntroductionCeiling Diffusers
Assembling FeaturesCeiling Diffusers
Ceiling diffusers shaped in both square and rectangle, have a strong profile construction with extruded, streamlined, aluminum alloy to withstand corrosion.
The blades are wing-shaped which ensures optimam air flow turbulence,thereby securing lower noise level.
Each diffuser, has a detachable snap-in middle core on its face, enabling easy installation. This also facilitates damper adjustments and maintenance. The core can be replaced without alterating the external frame.
Blades fixed in ascending dimension from the inner core forms a division and fixed to the external frame by dual loaded steel springs with four pins, results in centrally aligned core.
For preferred directional airflow, a choice of multi models in one way, two ways, three ways and four way diffusers avialable.
Customer’s requirements in various neck sizes ranging from 150 x 150mm to 600 x 600 mm can be provided. Also avilable with GI “neck adapters” according to the request.
One, two, three and four way patterns depends on the configuration of the room to be conditioned, number of diffuser installed in that room, type, and the location of lighting fixtures or other ornamental patterns mounted on the same ceiling.
Inner core enables to select various air supply patterns either for use in a corridor like areas or for a larger area where even air disbursement on all four sides need to be achieved.
97mm
Listed Size
Listed Size + 89mm
Listed Size + 140mm
30mm 60mm
30O
97mm
Listed Size
Listed Size + 89mm
Listed Size + 140mm
30mm 60mm
30O
OBD
Listed Size - 6mm
Without Damper With Damper
Listed Size - 6mm
Ceiling Diffusers | Assembling Features
2
EXCELAIR Air Outlets | Technical Catalogue
Dimensional Details
Ceiling Diffusers | Available Flow Patterns
3
Rectangular Ceiling Diffusers [RCD]
1 Way-DischargeHorizontal Blades
2 Way-DischargeHorizontal Blades
2 Way-Discharge Corner Blades
3 Way-Discharge
1 Way-DischargeVertical Blades
2 Way-Discharge Vertical Blades
2 Way-DischargeCorner Blades
4 Way-Discharge
Square Ceiling Diffusers [SCD]
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2 2Corner BladeWay-DischarWa Dischar
EXCELAIR Air Outlets | Technical Catalogue
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Available Flow PatternsCeiling Diffusers
Ceiling Diffusers | Performance Data
4
EXCELAIR Air Outlets | Technical Catalogue
One Way Air Flow Pattern:
Size
(mm)
Area Factor(Ak)
Neck Area(Sq. ft.)
Neck Velocity (fpm) 200 250 300 350 400 500 600 700 800 900
Velocity Pressure (In.w.g) .003 .004 .006 .008 .010 .016 .023 .031 .040 .051
Total Pressure (In.w.g) .015 .024 .034 .046 .060 .094 .136 .184 .240 .305
150 x 150Ak = .085
0.250
CFM THROW (ft.) NC (dB)
507-10
20
638-12
20
7510-15
20
8812-17
20
10014-19
20
12517-21
20
15019-23
23
17520-24
27
20022-26
31
22523-27
35
225 X 225Ak = .177
0.562
CFM THROW (ft.) NC (dB)
1109-13
20
14011-16
20
17014-18
20
19516-19
20
22517-21
20
28019-23
21
33521-25
27
39522-27
31
45024-29
35
50526-30
39
300 X 300Ak = .306
1.000
CFM THROW (ft.) NC (dB)
20011-16
20
25014-18
20
30016-19
20
35017-21
20
4001-22
20
50020-25
23
60022-27
30
70024-29
34
80026-31
38
90027-33
42
375 X 375Ak = .472
1.56
CFM THROW (ft.) NC (dB)
31013-17
20
39015-19
20
47017-20
20
54518-22
20
62519-23
21
78022-26
26
94024-28
32
109025-30
36
125027-32
40
140529-34
44
450 X 450Ak = .674
2.25
CFM THROW (ft.) NC (dB)
45014-18
20
56016-19
20
67517-21
20
78519-23
21
90020-24
23
112523-27
28
135025-30
34
157527-32
38
180029-34
42
202530-36
45
525 X 525Ak = .914
3.06
CFM THROW (ft.) NC (dB)
61015-18
20
76517-20
20
92018-22
20
107020-24
22
122521-25
23
153024-28
30
183526-31
36
214028-33
40
245030-35
44
275532-37
49
600 X 600Ak = 1.22
4.00
CFM THROW (ft.) NC (dB)
80015-19
20
100017-21
20
120019-23
20
140020-25
23
160022-26
24
200024-29
31
240027-32
37
280029-34
41
320031-37
45
360033-39
50
(Inches)
6 x 6
9 x 9
12 x 12
15 x 15
18 x 18
21 x 21
24 x 24
Two Way Air Flow Pattern:
Size
(mm)
AreaFactor(Ak)
Neck Velocity (fpm) 200 250 300 350 400 500 600 700 800 900
Velocity Pressure (In.w.g) .003 .004 .006 .008 .010 .016 .023 .031 .040 .051
Total Pressure (In.w.g) .014 .022 .032 .043 .057 .088 .128 .174 .226 .286
150 x 150Ak = .085
0.250
CFM THROW (ft.) NC (dB)
505-8
20
636-920
758-11
20
889-13
20
10010-14
20
12512-17
20
15015-21
23
17518-23
27
20020-25
31
22522-27
35
225 X 225Ak = .177
0.562
CFM THROW (ft.) NC
1107-10
20
1408-12
20
17010-15
20
19512-16
20
22514-19
20
28017-22
21
33520-24
27
39521-26
31
45023-27
35
50524-29
39
300 X 300Ak = .306
1.000
CFM THROW NC (dB)
2009-12
20
25011-15
20
30013-18
20
35015-20
20
40017-21
20
50020-24
23
60022-26
30
70023-28
34
80025-30
38
90026-32
42
375 X 375Ak = .472
1.56
CFM THROW (ft.) NC (dB)
31010-14
20
39012-18
20
47015-20
20
54517-21
20
62519-22
21
78021-25
26
94023-27
32
109025-29
36
125026-31
40
140528-33
44
450 X 450Ak = .674
2.25
CFM THROW (ft.) NC (dB)
45012-16
20
56014-19
20
67517-21
20
78518-22
21
90020-24
23
112522-26
28
135024-29
34
157526-31
38
180028-33
42
202529-35
45
525 X 525Ak = .914
3.06
CFM THROW (ft) NC (dB)
61013-18
20
76516-20
20
92018-21
20
107019-23
22
122520-25
23
153023-27
30
183525-30
36
214027-32
40
245029-34
44
275531-36
49
600 X 600Ak = 1.22
4.00
CFM THROW (dB) NC (dB)
80014-18
20
100017-20
20
120018-22
20
140020-24
23
160021-25
24
200024-28
31
240026-31
37
280028-33
41
320030-36
45
360032-38
50
Neck Area(Sq. ft.)(Inches)
6 x 6
9 x 9
12 x 12
15 x 15
18 x 18
21 x 21
24 x 24
Throw data in feet, based on isothermal air at 100 and 50 FPM terminal velocity
6000 7 09009700 800
050
009060
37
00
7 41 45
700 800
Square Ceiling Diffusers-Supply[SCD-S]
Performance DataCeiling Diffusers
Ceiling Diffusers | Performance Data
5
EXCELAIR Air Outlets | Technical Catalogue
Three Way Air Flow Pattern:
Size
(mm)
Neck Velocity (fpm) 200 250 300 350 400 500 600 700 800 900
Velocity Pressure (In. w.g) .003 .004 .006 .008 .010 .016 .023 .031 .040 .051
Total Pressure (In. w.g) .012 .019 .027 .036 .048 .074 .107 .146 .190 .240
150 x 150Ak = .085
0.250
CFM THROW (ft.) NC (dB)
503-520
634-620
754-720
885-8
20
1006-920
1258-11
20
1509-13
23
17510-15
27
20012-17
31
22514-19
35
225 X 225Ak = .177
0.562
CFM THROW (ft.) NC (dB)
1104-720
1405-8
20
1706-920
1957-11
20
2258-12
20
28010-15
21
33513-18
27
39515-21
31
45017-22
35
50519-23
39
300 X 300Ak = .306
1.000
CFM THROW (ft.) NC (dB)
2005-8
20
2506-10
20
3008-11
20
3509-13
20
40010-15
20
50013-19
23
60016-21
30
70018-22
34
80020-24
38
90021-25
42
375 X 375Ak = .472
1.56
CFM THROW (ft.) NC (dB)
3106-920
3908-11
20
4709-13
20
54511-15
20
62512-17
21
78016-20
26
94018-22
32
109020-24
36
125021-26
40
140522-27
44
450 X 450Ak = .674
2.25
CFM THROW (dB) NC (dB)
4507-11
20
5609-13
20
67511-15
20
78513-18
21
90014-19
23
112518-22
28
135020-24
34
157521-25
38
180023-27
42
202524-29
45
525 X 525Ak = .914
3.06
CFM THROW (ft.) NC (dB)
6108-12
20
76510-14
20
92012-17
20
107014-19
22
122516-20
23
153019-23
30
183521-25
36
214022-27
40
245024-28
44
275525-30
49
600 X 600Ak = 1.22
4.00
CFM THROW (ft.) NC (dB)
8009-13
20
100011-16
20
120013-18
20
140015-20
23
160017-21
24
200019-23
31
240021-25
37
280023-27
41
320025-29
45
360026-31
50
Area Factor(Ak)Neck Area
(Sq. ft.)(Inches)
9 x 9
12 x 12
15 x 15
18 x 18
21 x 21
24 x 24
6 x 6
Four Way Air Flow Pattern:
Size
(mm)
Neck Velocity (fpm) 200 250 300 350 400 500 600 700 800 900
Velocity Pressure (In. w.g) .003 .004 .006 .008 .010 .016 .023 .031 .040 .051
Total Pressure (In. w.g) .011 .017 .024 .032 .042 .066 .096 .130 .170 .215
150 x 150Ak = .085
0.250
CFM THROW (ft.) NC (dB)
502-420
633-620
754-720
885-8
20
1006-920
1257-11
20
1508-12
23
17510-14
27
20011-16
31
22513-18
35
225 X 225Ak = .177
0.562
CFM THROW (ft.) NC (dB)
1104-620
1405-720
1706-920
1957-10
20
2258-11
20
28010-13
21
33511-16
27
39513-19
31
45015-20
35
50517-21
39
300 X 300Ak = .306
1.000
CFM THROW (ft.) NC (dB)
2005-720
2506-920
3007-11
20
3508-12
20
40010-14
20
50012-17
23
60014-20
30
70017-21
34
80018-23
38
90020-24
42
375 X 375Ak = .472
1.56
CFM THROW (ft.) NC (dB)
3106-920
3907-11
20
4709-13
20
54510-15
20
62512-17
21
78014-19
26
94017-21
32
109018-22
36
125020-24
40
140521-25
44
450 X 450Ak = .674
2.25
CFM THROW (ft.) NC (dB)
4507-10
20
5608-12
20
67510-14
20
78512-16
21
90013-18
23
112516-20
28
135018-22
34
157520-24
38
180021-26
42
202522-27
45
525 X 525Ak = .914
3.06
CFM THROW (ft.) NC (dB)
6107-11
20
7659-13
20
92011-16
20
107013-18
22
122515-19
23
153018-22
30
183520-24
36
214021-25
40
245023-27
44
275524-29
49
600 X 600Ak = 1.22
4.00
CFM THROW (ft.) NC (dB)
8008-12
20
100010-15
20
120012-18
20
140014-19
23
160016-20
24
200019-23
31
240020-25
37
280022-26
41
320023-28
45
360025-30
50
Area Factor(Ak)Neck Area
(Sq. ft.)
9 x 9
12 x 12
15 x 15
18 x 18
21 x 21
24 x 24
6 x 6
(Inches)
Throw data in feet, based on isothermal air at 100 and 50 FPM terminal velocity
0 09077000 9800
7 41 45 50
Performance DataCeiling Diffusers
Square Ceiling Diffusers-Supply[SCD-S]
Ceiling Diffusers | Performance Data
6
EXCELAIR Air Outlets | Technical Catalogue
Performance DataCeiling Diffusers
Two Way Air Flow Pattern:
Size
(mm)
Neck Velocity (fpm) 200 250 300 350 400 500 600 700 800 900
Velocity Pressure (In. w.g) .003 .004 .006 .008 .010 .016 .023 .031 .040 .051
Total Pressure (In. w.g) .042 .066 .096 .130 .170 .265 .381 .518 .680 .852
150 x 150 CFM NC (dB)
5020
6320
7520
8820
10020
12520
15023
17527
20031
22535
225 X 225 CFM NC (dB)
11020
14020
17020
19520
22520
28021
33527
39531
45035
50539
300 X 300 CFM NC (dB)
20020
25020
30020
35020
40020
50023
60030
70034
80038
90042
375 X 375 CFM NC (dB)
31020
39020
47020
54520
62521
78026
94032
109036
125040
140544
450 X 450 CFM NC (dB)
45020
56020
67520
78521
90023
112528
135034
157538
180042
202545
525 X 525 CFM NC (dB)
61020
76520
92020
107022
122523
153030
183536
214040
245044
275549
600 X 600
0.250
0.562
1.000
1.56
2.25
3.06
4.00 CFM NC (dB)
80020
100020
120020
140023
160024
200031
240037
280041
320045
360050
(Sq. ft.)(Inches)
6 x 6
9 x 9
12 x 12
15 x 15
18 x 18
21 x 21
24 x 24
Size
(mm)
NeckArea
(Sq. ft.)
Neck Velocity (fpm) 200 250 300 350 400 500 600 700 800 900
Velocity Pressure (In. w.g) .003 .004 .006 .008 .010 .016 .023 .031 .040 .051
Total Pressure (In. w.g) .037 .058 .083 .112 .148 .230 .332 .450 .590 .752
150 x 150 0.250 CFM NC (dB)
5020
6320
7520
8820
10020
12520
15023
17527
20031
22535
225 X 225 0.562 CFM NC (dB)
11020
14020
17020
19520
22520
28021
33527
39531
45035
50539
300 X 300 1.000 CFM NC (dB)
20020
25020
30020
35020
40020
50023
60030
70034
80038
90042
375 X 375 1.56 CFM NC (dB)
31020
39020
47020
54520
62521
78026
94032
109036
125040
140544
450 X 450 2.25 CFM NC (dB)
45020
56020
67520
78521
90023
112528
135034
157538
180042
202545
525 X 525 3.06 CFM NC (dB)
61020
76520
92020
107022
122523
153030
183536
214040
245044
275549
600 X 600 4.00 CFM NC (dB)
80020
100020
120020
140023
160024
200031
240037
280041
320045
360050
(Inches)
6 x 6
9 x 9
12 x 12
15 x 15
18 x 18
21 x 21
24 x 24
One Way Air Flow Pattern:
Square Ceiling Diffusers-Return[SCD-R]
EXCELAIR Air Outlets | Technical Catalogue Ceiling Diffusers | Performance Data
7
Three Way Air Flow Pattern:
Size
(mm)
Neck Velocity (fpm) 200 250 300 350 400 500 600 700 800 900
Velocity Pressure (w.g) .003 .004 .006 .008 .010 .016 .023 .031 .040 .051
Total Pressure (w.g) 0.38 .059 .085 .107 .154 .235 .336 .460 .600 .757
150 x 150 0.2505020
6320
7520
8820
10020
12520
15022
17526
20030
22534
225 X 225 0.56211020
14020
17020
19520
22520
28020
33526
39530
45034
50538
300 X 300 1.00020020
25020
30020
35020
40020
50022
60029
70033
80037
90041
375 X 375 1.5631020
39020
47020
54520
62520
78025
94031
109035
125039
140543
450 X 450 2.2545020
56020
67520
78520
90022
112527
135033
157537
180041
202544
525 X 525 3.0661020
76520
92020
107021
122522
153029
183535
214039
245043
275548
600 X 600 4.00
CFM NC
CFM NC
CFM NC
CFM NC
CFM NC
CFM NC
CFM NC
80020
100020
120020
140022
160023
200030
240036
280040
320044
360049
NeckArea
(Sq. ft.)(Inches)
6 x 6
9 x 9
12 x 12
15 x 15
18 x 18
21 x 21
24 x 24
Four Way Air Flow Pattern:
Size
(mm)
Neck Velocity (fpm) 200 250 300 350 400 500 600 700 800 900
Velocity Pressure (w.g) .003 .004 .006 .008 .010 .016 .023 .031 .040 .051
Total Pressure (w.g) 0.43 .067 .097 .132 .172 .269 .388 .525 .690 .864
150 x 150 0.250 CFM NC
5020
6320
7520
8820
10020
12520
15022
17526
20030
22534
225 X 225 0.562 CFM NC
11020
14020
17020
19520
22520
28020
33526
39530
45034
50538
300 X 300 1.000 CFM NC
20020
25020
30020
35020
40020
50022
60029
70033
80037
90041
375 X 375 1.56 CFM NC
31020
39020
47020
54520
62520
78025
94031
109035
125039
140543
450 X 450 2.25 CFM NC
45020
56020
67520
78520
90022
112527
135033
157537
180041
202544
525 X 525 3.06 CFM NC
61020
76520
92020
107021
122522
153029
183535
214039
245043
275548
600 X 600 4.00 CFM NC
80020
100020
120020
140022
160023
200030
240036
280040
320044
360049
6 x 6
9 x 9
12 x 12
15 x 15
18 x 18
21 x 21
24 x 24
NeckArea
(Sq. ft.)(Inches)
000 000907000 800 9
Performance DataCeiling Diffusers
Square Ceiling Diffusers-Return[SCD-R]
EXCELAIR Air Outlets | Technical Catalogue 2011 Ceiling Diffusers | Performance Data
8
Performance DataCeiling Diffusers
Size(mm)
&(Inches)
Area Factor(AK)
Neck Area(Sq. ft.)
Neck Velocity (fpm)
Velocity Pressure in W.G.
Total Pressure in W.G.
Side
CFM Total
CFM/Side
Throw/Side
NC (dB)
CFM Total
CFM/Side
Throw/Side
NC (dB)
CFM Total
CFM/Side
Throw/Side
NC (dB)
CFM Total
CFM/Side
Throw/Side
NC (dB)
CFM Total
CFM/Side
Throw/Side
NC (dB)
CFM Total
CFM/Side
Throw/Side
NC (dB)
CFM Total
CFM/Side
Throw/Side
NC (dB)
CFM Total
CFM/Side
Throw/Side
NC (dB)
CFM Total
CFM/Side
Throw/Side
NC (dB)
CFM Total
CFM/Side
Throw/Side
NC (dB)
CFM Total
CFM/Side
Throw/Side
NC (dB)
CFM Total
CFM/Side
Throw/Side
NC (dB)
CFM Total
CFM/Side
Throw/Side
NC (dB)
CFM Total
CFM/Side
Throw/Side
NC (dB)
CFM Total
CFM/Side
Throw/Side
NC (dB)
225 x 150
9 x 6
300 x 150
12 x 6
300 x 225
12 x 9
375 x 150
15 x 6
375 x 225
15 x 9
375 x 300
15 x 12
450 x 150
18 x 6
450 x 225
18 x 9
450 x 300
18 x 12
525 x 150
21 x 6
525 x 225
21 x 9
525 x 300
21 x 12
600 x 150
24 x 6
600 x 225
24 x 9
600 x 300
24 x 12
Ak = .122
0.375
Ak = .158
0.500
Ak = .232
0.750
Ak = .195
0.625
Ak = .287
0.938
Ak = .380
1.25
Ak = .232
0.750
Ak = .343
1.125
Ak = .453
1.50
Ak = .269
0.875
Ak = .398
1.31
Ak = .523
1.75
Ak = .306
1.00
Ak = .453
1.50
Ak = .601
2.00
200
.003
.021
300
.006
.046
400
.010
.081
500
.016
.130
600
.023
.180
700
.031
.250
800
.040
.320
900
.051
.390
A B A B A B A B A B A B A B A B
75 110 150 190 225 265 300 337
75 -
-
110 - 150 - 190 - 225 - 265 - 300 - 337 -
20 20 20 20 25 29 33 37
10 - 14 -12 - 17 -14 - 20 -16 - 23 -17 - 25 -18 - 26 -20 - 28 -21 - 30
100 150 200 250 300 350 400 450
100 -
-
150 - 200 - 250 - 300 - 350 - 400 - 450 -
20 20 20 20 27 30 34 38
10 - 15 -12 - 17 -14 - 20 -16 - 23 -17 - 25 -18 - 26 -20 - 28 -21 - 30
150 225 300 375 450 525 600 675
150 -
-
225 - 300 - 375 - 450 - 525 - 600 - 675 -
20 20 20 22 28 32 36 40
13 - 19 -15 - 21 -17 - 24 -19 - 27 -21 - 30 -22 - 32 -24 - 34 -26 - 36
125 188 250 313 375 438 500 565
125 -
-
188 - 250 - 313 - 375 - 438 - 500 - 565 -
20 20 20 21 27 31 35 39
12 - 17 -14 - 19 -16 - 23 -18 - 25 -20 - 27 -21 - 29 -23 - 31 -24 - 33
188 281 375 469 563 656 750 845
188 -
-
281 - 375 - 469 - 563 - 656 - 750 - 845 -
20 20 20 23 29 33 37 41
14 - 19 -16 - 23 -18 - 26 -21 - 30 -22 - 32 -24 - 34 -25 - 37 -27 - 39
250 375 500 625 750 875 1000 1125
250 -
-
375 - 500 - 625 - 750 - 875 - 1000 - 1125 -
20 20 20 25 31 35 39 43
15 - 21 -17 - 24 -20 - 28 -23 - 32 -25 - 34 -26 - 37 -28 - 40 -30 - 42
150 225 300 375 450 525 600 675
150 -
-
225 - 300 - 375 - 450 - 525 - 600 - 675 -
20 20 20 22 28 32 36 40
13 - 19 -15 - 21 -17 - 24 -19 - 27 -21 - 30 -22 - 32 -24 - 34 -26 - 36
225 338 450 563 675 788 900 1012
225 -
-
338 - 450 - 563 - 675 - 788 - 900 - 1012 -
20 20 20 24 30 34 38 42
14 - 19 -16 - 23 -18 - 26 -21 - 30 -22 - 32 -24 - 34 -25 - 37 -27 - 39
300 450 600 750 900 1050 1200 1350
300 -
-
450 - 600 - 750 - 900 - 1050 - 1200 - 1350 -
20 20 20 26 32 36 40 44
14 - 20 -17 - 24 -20 - 28 -23 - 32 -25 - 34 -26 - 37 -28 - 40 -30 - 42
175 263 350 438 525 613 700 787
175 -
-
263 - 350 - 438 - 525 - 613 - 700 - 787 -
20 20 20 22 28 32 36 40
13 - 19 -15 - 21 -17 - 24 -19 - 27 -21 - 30 -22 - 32 -24 - 34 -26 - 36
263 394 525 656 788 919 1050 1181
263 -
-
394 - 525 - 656 - 788 - 919 - 1050 - 1181 -
20 20 20 24 30 34 38 42
15 - 21 -17 - 24 -20 - 28 -23 - 32 -25 - 34 -26 - 37 -28 - 40 -30 - 42
350 525 700 875 1050 1225 1400 1575
350 -
-
525 - 700 - 875 - 1050 - 1225 - 1400 - 1575 -
20 20 20 26 32 36 40 44
15 - 22 -18 - 26 -21 - 30 -24 - 34 -26 - 37 -28 - 40 -30 - 42 -32 - 45
200 300 400 500 600 700 800 900
200 -
-
300 - 400 - 500 - 600 - 700 - 800 - 900 -
20 20 20 23 29 33 37 41
14 - 20 -16 - 23 -18 - 26 -21 - 30 -22 - 32 -24 - 34 -25 - 37 -27 - 39
300 450 600 750 900 1050 1200 1350
300 -
-
450 - 600 - 750 - 900 - 1050 - 1200 - 1350 -
20 20 20 25 31 35 39 43
14 - 20 -17 - 24 -20 - 28 -23 - 32 -25 - 37 -26 - 37 -28 - 40 -30 - 42
400 600 800 1000 1200 1400 1600 1800
400 - 600 - 800 - 1000 - 1200 - 1400 - 1600 - 1800 -
-
20 20 20 27 33 37 41 45
17 - 24 -20 - 28 -23 - 32 -26 - 37 -28 - 39 -30 - 42 -33 - 45 -35 - 48
One Way Airflow Pattern
Throw data in feet, based on isothermal air at 100 and 50 FPM terminal velocity
AAA
Rectangular Ceiling Diffusers-Supply[RCD-S]
Ceiling Diffusers | Performance Data
9
EXCELAIR Air Outlets | Technical Catalogue
Performance DataCeiling Diffusers
700
.031
.200
800
.040
.260
900
.051
.319
A B A B A B
263 300 337
175 88 200 100 225 112
29 33 37
12 - 1615 - 21 13 - 1716 - 23 14 - 1817 - 24
350 400 450
266 87 300 100 338 112
30 34 38
12 - 1618 - 26 13 - 1720 - 28 14 - 1821 - 30
525 600 675
329 196 375 225 423 252
32 36 40
15 - 2018 - 26 16 - 2120 - 28 17 - 2321 - 30
438 500 563
350 87 400 100 450 112
31 35 39
12 - 1618 - 26 23 - 1720 - 28 14 - 1821 - 30
656 750 845
459 197 525 225 592 253
33 37 41
15 - 2021 - 28 16 - 2123 - 31 17 - 2324 - 33
875 1000 1125
525 350 600 400 675 450
35 39 43
17 - 3422 - 32 18 - 2524 - 34 20 - 2726 - 36
525 600 675
434 91 496 104 558 117
32 36 40
12 - 1621 - 29 13 - 1723 - 31 14 - 1824 - 33
788 900 1012
591 197 565 225 759 253
34 38 42
15 - 2022 - 32 16 - 2124 - 34 17 - 2326 - 36
1050 1200 1350
700 350 800 400 900 450
36 40 44
17 - 2424 - 34 18 - 2525 - 37 20 - 2727 - 39
613 700 787
525 87 600 100 675 112
32 36 40
12 - 1622 - 32 13 - 1724 - 34 14 - 1826 - 36
919 1050 1181
720 199 825 225 927 253
34 38 42
15 - 2024 - 34 16 - 2125 - 37 17 - 2327 - 39
1225 1400 1575
875 350 1000 400 1125 450
36 40 44
17 - 2426 - 37 18 - 2528 - 40 20 - 2730 - 42
700 800 900
613 87 700 100 788 112
33 37 41
12 - 1622 - 32 13 - 1724 - 34 14 - 1826 - 36
1050 1200 1350
855 197 975 225 1097 253
35 39 43
15 - 2026 - 37 16 - 2128 - 40 17 - 2330 - 42
1400 1600 1800
1050 350 1200 400 1350 450
37 41 45
17 - 2426 - 37 18 - 2528 - 40 20 - 2730 - 42
Size(mm)
&(Inches)
Area Factor(AK)
Neck Area(Sq. ft.)
Neck Velocity (fpm)
Velocity Pressure in W.G.
Total Pressure in W.G.
Side
CFM Total
CFM/Side
Throw/Side
NC (dB)
CFM Total
CFM/Side
Throw/Side
NC (dB)
CFM Total
CFM/Side
Throw/Side
NC (dB)
CFM Total
CFM/Side
Throw/Side
NC (dB)
CFM Total
CFM/Side
Throw/Side
NC (dB)
CFM Total
CFM/Side
Throw/Side
NC (dB)
CFM Total
CFM/Side
Throw/Side
NC (dB)
CFM Total
CFM/Side
Throw/Side
NC (dB)
CFM Total
CFM/Side
Throw/Side
NC (dB)
CFM Total
CFM/Side
Throw/Side
NC (dB)
CFM Total
CFM/Side
Throw/Side
NC (dB)
CFM Total
CFM/Side
Throw/Side
NC (dB)
CFM Total
CFM/Side
Throw/Side
NC (dB)
CFM Total
CFM/Side
Throw/Side
NC (dB)
CFM Total
CFM/Side
Throw/Side
NC (dB)
225 x 150
9 x 6
300 x 150
12 x 6
300 x 225
12 x 9
375 x 150
15 x 6
375 x 225
15 x 9
375 x 300
15 x 12
450 x 150
18 x 6
450 x 225
18 x 9
450 x 300
18 x 12
525 x 150
21 x 6
525 x 225
21 x 9
525 x 300
21 x 12
600 x 150
24 x 6
600 x 225
24 x 9
600 x 300
24 x 12
Ak = .122
0.375
Ak = .158
0.500
Ak = .232
0.750
Ak = .195
0.625
Ak = .287
0.938
Ak = .380
1.25
Ak = .232
0.750
Ak = .343
1.125
Ak = .453
1.50
Ak = .269
0.875
Ak = .398
1.31
Ak = .523
1.75
Ak = .306
1.00
Ak = .453
1.50
Ak = .601
2.00
200
.003
.016
300
.006
.036
400
.010
.064
500
.016
.100
600
.023
.140
A B A B A B A B A B
75 113 150 188 225
50 25
7 - 9
75 38 100 50 125 63 150 75
20 20 20 20 25
8 - 12 8 - 1010 - 14 9 - 1211 - 16 10 - 1413 - 18 11 - 1514 - 20
100 150 200 250 300
75 25
7 - 9
112 38 150 50 188 62 225 75
20 20 20 20 27
10 - 14 8 - 1012 - 17 9 - 1214 - 20 10 - 1416 - 23 11 - 1517 - 25
150 225 300 375 450
94 56
8 - 11
141 84 188 112 235 140 282 168
20 20 20 22 28
10 - 14 10 - 1312 - 17 11 - 1514 - 20 13 - 1716 - 23 14 - 1817 - 25
125 188 250 313 375
100 25
7 - 9
150 37 200 50 250 62 300 75
20 20 20 21 27
10 - 14 8 - 1012 - 17 9 - 1214 - 20 10 - 1416 - 23 11 - 1517 - 25
188 281 375 469 563
131 56
8 - 11
197 84 263 212 329 141 394 169
20 20 20 23 29
12 - 16 10 - 1314 - 19 11 - 1516 - 22 13 - 1718 - 25 14 - 1820 - 27
250 375 500 625 750
150 100
9 - 14
225 150 300 200 375 250 450 300
20 20 20 25 31
13 - 18 11 - 1615 - 21 13 - 1817 - 24 15 - 2119 - 27 16 - 2221 - 30
150 225 300 375 450
124 26
7 - 9
186 39 248 52 310 65 372 78
20 20 20 22 28
12 - 16 8 - 1014 - 19 9 - 1216 - 22 10 - 1418 - 25 11 - 1520 - 27
225 338 450 563 675
169 56
9 - 11
254 84 338 112 422 141 506 169
20 20 20 24 30
13 - 18 10 - 1315 - 21 11 - 1517 - 24 13 - 1719 - 27 14 - 1821 - 30
300 450 600 750 900
200 100
9 - 14
300 150 400 200 500 250 600 300
20 20 20 26 32
14 - 20 11 - 1616 - 23 13 - 1818 - 26 15 - 2121 - 30 16 - 2222 - 32
175 263 350 438 525
150 25
7 - 9
225 38 300 50 375 63 450 75
20 20 20 22 28
14 - 18 8 - 1015 - 21 9 - 1217 - 24 10 - 1419 - 27 11 - 1521 - 30
263 394 525 656 788
206 57
9 - 11
308 85 412 113 514 142 618 170
20 20 20 24 30
14 - 20 10 - 1316 - 23 11 - 1518 - 26 13 - 1721 - 30 14 - 1822 - 32
350 525 700 875 1050
250 100
9 - 14
375 150 500 200 625 250 750 300
20 20 20 26 32
14 - 20 11 - 1617 - 24 13 - 1820 - 28 15 - 2123 - 32 16 - 2225 - 34
200 300 400 500 600
175 25
7 - 9
263 37 350 50 438 62 525 75
20 20 20 23 29
13 - 18 8 - 1015 - 21 9 - 1217 - 24 10 - 1419 - 27 11 - 1521 - 30
300 450 600 750 900
244 56
9 - 11
366 84 488 112 609 141 731 169
20 20 20 25 31
14 - 20 10 - 1317 - 24 11 - 1520 - 28 13 - 1723 - 32 14 - 1825 - 34
400 600 800 1000 1200
300 100 450 150 600 200 750 250 900 300
9 - 14
20 20 20 27 33
14 - 20 11 - 1417 - 20 13 - 1820 - 28 15 - 2123 - 32 16 - 2225 - 34
Throw data in feet, based on isothermal air at 100 and 50 FPM terminal velocity
Two Way Air Flow Pattern:
B
ARectangular Ceiling Diffusers-Supply[RCD-S]
B
A
B
A
Ceiling Diffusers | Performance Data
10Throw data in feet, based on isothermal air at 100 and 50 FPM terminal velocity
Size(mm)
&(Inches)
Area Factor(AK)
Neck Area(Sq. ft.)
Neck Velocity (fpm)
Velocity Pressure in W.G.
Total Pressure in W.G.
Side
CFM Total
CFM/Side
Throw/Side
NC (dB)
CFM Total
CFM/Side
Throw/Side
NC (dB)
CFM Total
CFM/Side
Throw/Side
NC (dB)
CFM Total
CFM/Side
Throw/Side
NC (dB)
CFM Total
CFM/Side
Throw/Side
NC (dB)
CFM Total
CFM/Side
Throw/Side
NC (dB)
CFM Total
CFM/Side
Throw/Side
NC (dB)
CFM Total
CFM/Side
Throw/Side
NC (dB)
CFM Total
CFM/Side
Throw/Side
NC (dB)
CFM Total
CFM/Side
Throw/Side
NC (dB)
CFM Total
CFM/Side
Throw/Side
NC (dB)
CFM Total
CFM/Side
Throw/Side
NC (dB)
CFM Total
CFM/Side
Throw/Side
NC (dB)
CFM Total
CFM/Side
Throw/Side
NC (dB)
CFM Total
CFM/Side
Throw/Side
NC (dB)
225 x 150
9 x 6
300 x 150
12 x 6
300 x 225
12 x 9
375 x 150
15 x 6
375 x 225
15 x 9
375 x 300
15 x 12
450 x 150
18 x 6
450 x 225
18 x 9
450 x 300
18 x 12
525 x 150
21 x 6
525 x 225
21 x 9
525 x 300
21 x 12
600 x 150
24 x 6
600 x 225
24 x 9
600 x 300
24 x 12
Ak = .122
0.375
Ak = .158
0.500
Ak = .232
0.750
Ak = .195
0.625
Ak = .287
0.938
Ak = .380
1.25
Ak = .232
0.750
Ak = .343
1.125
Ak = .453
1.50
Ak = .269
0.875
Ak = .398
1.31
Ak = .523
1.75
Ak = .306
1.00
Ak = .453
1.50
Ak = .601
2.00
200
.003
.016
300
.006
.036
400
.010
.064
500
.016
.100
600
.023
.140
700
.031
.200
800
.040
.260
900
.051
.319
A B A B A B A B A B A B A B A B
75 113 150 188 225 263 300 337
31 13
4 - 6
47 19 62 26 78 32 93 39 109 45 124 52 140 59
20 20 20 20 25 29 33 37
7 - 9 5 - 78 - 11 6 - 89 - 13 7 - 910 - 15 7 - 1011 - 16 8 - 1112 - 17 8 - 1113 - 18 9 - 1214 - 20
100 150 200 250 300 350 400 450
43 14
4 - 6
65 20 86 28 108 34 129 42 151 48 172 56 194 52
20 20 20 20 27 30 34 38
9 - 12 5 - 710 - 14 6 - 811 - 16 7 - 913 - 18 7 - 1014 - 20 8 - 1115 - 21 8 - 1116 - 23 9 - 1217 - 24
150 225 300 375 450 525 600 675
61 28
5 - 8
92 41 122 56 153 69 183 84 213 98 244 112 275 125
20 20 20 22 28 32 36 40
9 - 14 6 - 911 - 16 7 - 1013 - 18 8 - 1115 - 21 9 - 1216 - 22 9 - 1317 - 24 10 - 1418 - 26 11 - 1520 - 27
125 188 250 313 375 438 500 563
56 13
4 - 6
84 20 112 26 140 33 169 37 197 44 225 50 253 58
20 20 20 21 27 31 35 39
8 - 13 5 - 710 - 15 6 - 812 - 17 7 - 914 - 19 7 - 1015 - 21 8 - 1116 - 22 8 - 1117 - 24 9 - 1218 - 26
188 281 375 469 563 656 750 845
80 28
5 - 8
120 42 159 56 200 70 240 84 279 98 319 112 359 126
20 20 20 23 29 33 37 41
10 - 14 6 - 912 - 17 7 - 1014 - 20 8 - 1116 - 23 9 - 1217 - 25 9 - 1318 - 26 10 - 1420 - 28 11 - 1621 - 30
250 375 500 625 750 875 1000 1125
100 50
7 - 9
150 75 200 100 250 125 300 150 350 175 400 200 450 225
20 20 20 25 31 35 39 43
10 - 14 8 - 1012 - 17 9 - 1214 - 20 10 - 1416 - 23 11 - 1517 - 25 12 - 1618 - 26 13 - 1720 - 28 14 - 1821 - 30
150 225 300 375 450 525 600 675
124 26
7 - 9
186 39 248 52 310 65 372 78 434 91 496 104 558 117
20 20 20 22 28 32 36 40
12 - 16 8 - 1014 - 19 9 - 1216 - 22 10 - 1418 - 25 11 - 1520 - 27 12 - 1621 - 29 13 - 1723 - 31 14 - 1824 - 33
225 338 450 563 675 788 900 1012
98 29
5 - 7
147 43 196 58 246 70 294 87 345 98 394 112 441 130
20 20 20 24 30 34 38 42
10 - 14 6 - 912 - 17 7 - 1014 - 20 8 - 1116 - 23 9 - 1217 - 25 9 - 1318 - 26 10 - 1420 - 28 11 - 1521 - 30
300 450 600 750 900 1050 1200 1350
125 50
5 - 7
187 75 250 100 312 125 375 150 437 175 500 200 562 225
20 20 20 26 32 36 40 44
10 - 14 6 - 912 - 17 7 - 1014 - 20 8 - 1116 - 23 9 - 1217 - 25 9 - 1318 - 26 10 - 1420 - 28 11 - 1521 - 30
175 263 350 438 525 613 700 787
75 12
4 - 6
113 18 150 25 188 31 225 37 262 44 300 50 337 56
20 20 20 22 28 32 36 40
10 - 14 5 - 712 - 17 6 - 814 - 20 7 - 916 - 23 7 - 1017 - 25 8 - 1118 - 26 8 - 1120 - 28 9 - 1221 - 30
263 394 525 656 788 919 1050 1181
103 28
5 - 8
154 42 206 56 258 70 309 84 360 98 413 112 484 126
20 20 20 24 30 34 38 42
12 - 16 6 - 914 - 19 7 - 1016 - 22 8 - 1118 - 25 8 - 1220 - 27 9 - 1321 - 29 10 - 1423 - 31 11 - 1524 - 33
350 525 700 875 1050 1225 1400 1575
125 50
7 - 8
187 75 250 100 312 125 375 150 437 175 500 200 562 225
20 20 20 26 32 36 40 44
12 - 16 8 - 1014 - 19 9 - 1216 - 22 10 - 14 18 - 25 11 - 1520 - 27 12 - 1621 - 29 13 - 1722 - 31 14 - 1824 - 33
200 300 400 500 600 700 800 900
87 12
4 - 6
131 81 175 25 219 31 262 37 306 44 350 50 394 56
20 20 20 23 29 33 37 41
10 - 14 5 - 712 - 17 6 - 814 - 20 7 - 916 - 23 7 - 1017 - 25 8 - 1118 - 26 8 - 1120 - 28 9 - 1221 - 30
300 450 600 750 900 1050 1200 1350
122 28
5 - 7
183 42 244 56 305 70 366 84 427 98 488 112 549 126
20 20 20 25 31 35 39 43
12 - 16 6 - 914 - 19 7 - 1016 - 22 8 - 1118 - 25 9 - 1220 - 27 9 - 1321 - 29 10 - 1423 - 31 11 - 1524 - 33
400 600 800 1000 1200 1400 1600 1800
150 50 225 75 300 100 375 125 450 150 525 175 600 200 875 225
7 - 9
20 20 20 27 33 37 41 45
13 - 18 8 - 1015 - 21 9 - 1217 - 24 10 - 1419 - 24 11 - 1521 - 30 12 - 1622 - 32 13 - 1724 - 34 14 - 1823 - 36
Rectangular Ceiling Diffusers-Supply[RCD-S]
Three Way Air Flow Pattern:
EXCELAIR Air Outlets | Technical Catalogue
A
B
A
Performance DataCeiling Diffusers
Ceiling Diffusers | Performance Data
11
Throw data in feet, based on isothermal air at 100 and 50 FPM terminal velocity
Rectangular Ceiling Diffusers-Supply[RCD-S]
Four Way Air Flow Pattern:
Size(mm)
&(Inches)
Area Factor(AK)
Neck Area(Sq. ft.)
Neck Velocity (fpm)
Velocity Pressure in W.G.
Total Pressure in W.G.
Side
CFM Total
CFM/Side
Throw/Side
NC (dB)
CFM Total
CFM/Side
Throw/Side
NC (dB)
CFM Total
CFM/Side
Throw/Side
NC (dB)
CFM Total
CFM/Side
Throw/Side
NC (dB)
CFM Total
CFM/Side
Throw/Side
NC (dB)
CFM Total
CFM/Side
Throw/Side
NC (dB)
CFM Total
CFM/Side
Throw/Side
NC (dB)
CFM Total
CFM/Side
Throw/Side
NC (dB)
CFM Total
CFM/Side
Throw/Side
NC (dB)
CFM Total
CFM/Side
Throw/Side
NC (dB)
CFM Total
CFM/Side
Throw/Side
NC (dB)
CFM Total
CFM/Side
Throw/Side
NC (dB)
CFM Total
CFM/Side
Throw/Side
NC (dB)
CFM Total
CFM/Side
Throw/Side
NC (dB)
CFM Total
CFM/Side
Throw/Side
NC (dB)
225 x 150
9 x 6
300 x 150
12 x 6
300 x 225
12 x 9
375 x 150
15 x 6
375 x 225
15 x 9
375 x 300
15 x 12
450 x 150
18 x 6
450 x 225
18 x 9
450 x 300
18 x 12
525 x 150
21 x 6
525 x 225
21 x 9
525 x 300
21 x 12
600 x 150
24 x 6
600 x 225
24 x 9
600 x 300
24 x 12
Ak = .122
0.375
Ak = .158
0.500
Ak = .232
0.750
Ak = .195
0.625
Ak = .287
0.938
Ak = .380
1.25
Ak = .232
0.750
Ak = .343
1.125
Ak = .453
1.50
Ak = .269
0.875
Ak = .398
1.31
Ak = .523
1.75
Ak = .306
1.00
Ak = .453
1.50
Ak = .601
2.00
200
.003
.015
300
.006
.033
400
.010
.058
500
.016
.091
600
.023
.130
700
.031
.180
800
.040
.230
900
.051
.310
A B A B A B A B A B A B A B A B
75 113 150 188 225 263 300 337
25 12
4 - 6
38 18 50 25 63 31 75 37 87 44 100 50 112 56
20 20 20 20 25 29 33 37
7 - 9 5 - 78 - 10 6 - 89 - 12 7 - 910 - 14 7 - 1011 - 15 8 - 1112 - 16 8 - 1113 - 17 9 - 1214 - 18
100 150 200 250 300 350 400 450
38 12
4 - 6
57 18 76 24 94 31 113 37 133 42 152 48 171 54
20 20 20 20 27 30 34 38
9 - 11 5 - 710 - 13 7 - 811 - 15 7 - 913 - 17 7 - 1014 - 18 8 - 1115 - 20 8 - 1116 - 21 8 - 1217 - 23
150 225 300 375 450 525 600 675
47 28
5 - 8
70 42 94 56 117 70 141 84 164 98 138 112 211 126
20 20 20 22 28 32 36 40
8 - 10 6 - 99 - 12 7 - 1010 - 14 8 - 1111 - 16 9 - 1212 - 17 9 - 1313 - 18 10 - 1414 - 20 11 - 1515 - 21
125 188 250 313 375 438 500 563
50 12
4 - 6
75 18 100 25 125 31 150 37 175 44 200 50 225 56
20 20 20 21 27 31 35 39
9 - 12 5 - 710 - 14 6 - 811 - 16 7 - 913 - 18 7 - 1014 - 20 8 - 1115 - 21 9 - 1116 - 23 9 - 1217 - 24
188 281 375 469 563 656 750 845
66 28
5 - 8
99 42 132 56 165 70 198 84 230 98 263 112 296 126
20 20 20 23 29 33 37 41
9 - 14 6 - 911 - 16 7 - 1013 - 18 8 - 1115 - 21 9 - 1216 - 22 9 - 1317 - 24 10 - 1418 - 25 11 - 1520 - 27
250 375 500 625 750 875 1000 1125
75 50
7 - 8
112 75 150 100 187 125 225 150 262 175 300 200 337 225
20 20 20 25 31 35 39 43
9 - 12 8 - 1010 - 14 9 - 1211 - 16 10 - 1413 - 18 11 - 1514 - 20 12 - 1615 - 21 13 - 1716 - 23 14 - 1817 - 24
150 225 300 375 450 525 600 675
63 12
4 - 6
94 18 125 25 158 31 188 37 220 42 250 50 283 54
20 20 20 22 28 32 36 40
9 - 14 5 - 711 - 16 6 - 813 - 18 7 - 915 - 21 7 - 1018 - 22 8 - 1117 - 24 8 - 1118 - 25 9 - 1220 - 27
225 338 450 563 675 788 900 1012
85 28
5 - 8
126 42 169 56 211 70 254 84 296 98 338 112 380 126
20 20 20 24 30 34 38 42
10 - 14 6 - 912 - 17 7 - 1014 - 20 8 - 1116 - 23 9 - 1217 - 25 9 - 1318 - 26 10 - 1420 - 28 11 - 1521 - 30
300 450 600 750 900 1050 1200 1350
100 50
7 - 8
150 75 200 100 250 125 300 150 350 175 400 200 450 225
20 20 20 26 32 36 40 44
10 - 14 8 - 1012 - 17 9 - 1214 - 20 10 - 1416 - 23 11 - 1517 - 25 12 - 1618 - 26 13 - 1720 - 28 14 - 1821 - 30
175 263 350 438 525 613 700 787
75 12
4 - 6
113 18 150 25 188 31 225 37 262 44 300 50 337 56
20 20 20 22 28 32 36 40
10 - 14 5 - 712 - 17 6 - 814 - 20 7 - 916 - 23 7 - 1017 - 25 8 - 1118 - 26 8 - 1120 - 28 9 - 1221 - 30
263 394 525 656 788 919 1050 1181
103 28
5 - 8
154 42 206 56 258 70 309 84 360 98 413 112 484 126
20 20 20 24 30 34 38 42
12 - 16 6 - 914 - 19 7 - 1016 - 22 8 - 1118 - 25 8 - 1220 - 27 9 - 1321 - 29 10 - 1423 - 31 11 - 1524 - 33
350 525 700 875 1050 1225 1400 1575
125 50
7 - 8
187 75 250 100 312 125 375 150 437 175 500 200 562 225
20 20 20 26 32 36 40 44
12 - 16 8 - 1014 - 19 9 - 1216 - 22 10 - 14 18 - 25 11 - 1520 - 27 12 - 1621 - 29 13 - 1722 - 31 14 - 1824 - 33
200 300 400 500 600 700 800 900
87 12
4 - 6
131 81 175 25 219 31 262 37 306 44 350 50 394 56
20 20 20 23 29 33 37 41
10 - 14 5 - 712 - 17 6 - 814 - 20 7 - 916 - 23 7 - 1017 - 25 8 - 1118 - 26 8 - 1120 - 28 9 - 1221 - 30
300 450 600 750 900 1050 1200 1350
122 28
5 - 7
183 42 244 56 305 70 366 84 427 98 488 112 549 126
20 20 20 25 31 35 39 43
12 - 16 6 - 914 - 19 7 - 1016 - 22 8 - 1118 - 25 9 - 1220 - 27 9 - 1321 - 29 10 - 1423 - 31 11 - 1524 - 33
400 600 800 1000 1200 1400 1600 1800
150 50 225 75 300 100 375 125 450 150 525 175 600 200 875 225
7 - 9
20 20 20 27 33 37 41 45
13 - 18 8 - 1015 - 21 9 - 1217 - 24 10 - 1419 - 24 11 - 1521 - 30 12 - 1622 - 32 13 - 1724 - 34 14 - 1823 - 36
EXCELAIR Air Outlets | Technical Catalogue
B
A
B
A
Performance DataCeiling Diffusers
Ceiling Diffusers | Performance Data
12
One Way Air Flow Pattern:
Size(mm)
&Inches
Neck Area(Sq.ft)
Neck Velocity (fpm) 200 300 400 500 600 700 800 900
Velocity Pressure (w.g) .004 .007 .009 .014 .019 .025 .035 .045
Negative Static Pressure(in. w.g)
.051 .113 .199 .320 .444 .617 .789 .962
225x1500.375
CFM 74 112 152 186 226 259 300 336
NC 19 19 20 21 23 27 31 36
300x1500.500
CFM 95 145 195 245 295 345 395 445
NC 19 19 20 20 25 28 32 37
300x2250.750
CFM 143 218 293 368 443 518 593 668
NC 19 19 20 21 26 30 34 39
375x1500.625
CFM 124 186 247 310 372 433 497 561
NC 19 19 20 21 25 29 33 38
375x2250.938
CFM 188 280 369 463 561 652 747 839
NC 20 20 20 21 27 31 35 40
375x3001.25
CFM 244 269 496 621 746 871 993 1121
NC 20 20 20 23 29 33 37 42
450x1500.750
CFM 145 220 295 370 445 520 595 670
NC 20 20 20 20 26 30 36 39
450x2251.125
CFM 220 332 443 559 662 783 893 1011
NC 19 20 20 22 28 32 36 41
450x3001.50
CFM 295 445 595 745 895 1045 1195 1345
NC 20 20 20 24 30 34 38 43
525x1500.875
CFM 170 658 345 433 520 609 695 782
NC 20 20 20 20 26 30 34 39
525x2251.31
CFM 260 391 522 553 785 916 1042 1176
NC 20 20 20 20 28 32 36 41
525x3001.75
CFM 345 520 695 870 1045 1220 1395 1570
NC 20 20 20 20 30 34 38 43
600x1501.00
CFM 195 295 395 495 595 690 790 890
NC 20 20 20 21 27 31 35 40
600x2251.50
CFM 290 440 590 740 890 1040 1190 1340
NC 20 20 20 23 29 33 37 42
600x3002.00
CFM 390 590 790 990 1190 1390 1590 1790
NC 20 20 20 25 31 35 39 44
9 x 6
12 x 6
12 x 9
15 x 6
15 x 9
15 x 12
18 x 6
18 x 9
18 x 12
21 x 6
21 x 9
21 x 12
24 x 6
24 x 9
24 x 12
EXCELAIR Air Outlets | Technical Catalogue
Performance DataCeiling Diffusers
Rectangular Ceiling Diffusers-Return[RCD-R]
Ceiling Diffusers | Performance Data
13
Two Way Airflow Pattern:
Size(mm) Neck Area
(Sq.ft)
Neck Velocity (fpm) 200 300 400 500 600 700 800 900
Velocity Pressure (w.g) .004 .007 .009 .014 .019 .025 .035 .045
Negative Static Pressure(in. w.g)
.049 .109 .193 .302 .422 .602 .782 .962
225x1500.375
CFM 72 111 147 185 222 260 297 332
NC 19 19 20 21 23 27 31 36
300x1500.500
CFM 90 140 190 240 290 340 390 440
NC 19 19 20 20 25 28 32 37
300x2250.750
CFM 145 220 295 370 445 520 595 670
NC 19 19 20 21 26 30 34 39
375x1500.625
CFM 127 190 252 315 376 440 502 565
NC 19 19 20 21 25 29 33 38
375x2250.938
CFM 185 276 370 464 558 651 745 840
NC 20 20 20 21 27 31 35 40
375x3001.25
CFM 245 370 495 620 745 870 995 1120
NC 20 20 20 23 29 33 37 42
450x1500.750
CFM 145 220 295 370 445 520 595 670
NC 20 20 20 20 26 30 36 39
450x2251.125
CFM 220 333 445 558 670 783 895 1007
NC 19 20 20 22 28 32 36 41
450x3001.50
CFM 295 445 595 745 895 1045 1195 1345
NC 20 20 20 24 30 34 38 43
525x1500.875
CFM 170 258 345 433 520 608 895 782
NC 20 20 20 20 26 30 34 39
525x2251.31
CFM 258 389 520 651 783 914 1045 1176
NC 20 20 20 20 28 32 36 41
525x3001.75
CFM 345 520 695 870 1045 1220 1395 1570
NC 20 20 20 20 30 34 38 43
600x1501.00
CFM 195 295 395 495 595 695 795 895
NC 20 20 20 21 27 31 35 40
600x2251.50
CFM 295 445 595 745 895 1045 1195 1345
NC 20 20 20 23 29 33 37 42
600x3002.00
CFM 395 595 795 995 1195 1395 1595 1795
NC 20 20 20 25 31 35 39 44
9 x 6
12 x 6
12 x 9
15 x 6
15 x 9
15 x 12
18 x 6
18 x 9
18 x 12
21 x 6
21 x 9
21 x 12
24 x 6
24 x 9
24 x 12
&(Inches)
EXCELAIR Air Outlets | Technical Catalogue
Performance DataCeiling Diffusers
Rectangular Ceiling Diffusers-Return[RCD-R]
Ceiling Diffusers | Performance Data
14
Three Way Airflow Pattern:
Size(mm)
Neck Area(Sq.ft)
Neck Velocity (fpm) 200 300 400 500 600 700 800 900
Velocity Pressure (w.g) .004 .007 .009 .014 .019 .025 .035 .045
Negative Static Pressure(in. w.g)
.040 .091 .164 .252 .379 .506 .664 .807
225x1500.375
CFM 72 111 147 185 222 260 297 332
NC 19 19 20 21 23 27 31 36
300x1500.500
CFM 90 140 190 240 290 340 390 440
NC 19 19 20 20 25 28 32 37
300x2250.750
CFM 145 220 295 370 445 520 595 670
NC 19 19 20 21 26 30 34 39
375x1500.625
CFM 127 190 252 315 376 440 502 565
NC 19 19 20 21 25 29 33 38
375x2250.938
CFM 185 276 370 464 558 651 745 840
NC 20 20 20 21 27 31 35 40
375x3001.25
CFM 245 370 495 620 745 870 995 1120
NC 20 20 20 23 29 33 37 42
450x1500.750
CFM 145 220 295 370 445 520 595 670
NC 20 20 20 20 26 30 36 39
450x2251.125
CFM 220 333 445 558 670 783 895 1007
NC 19 20 20 22 28 32 36 41
450x3001.50
CFM 295 445 595 745 895 1045 1195 1345
NC 20 20 20 24 30 34 38 43
525x1500.875
CFM 170 258 345 433 520 608 895 782
NC 20 20 20 20 26 30 34 39
525x2251.31
CFM 258 389 520 651 783 914 1045 1176
NC 20 20 20 20 28 32 36 41
525x3001.75
CFM 345 520 695 870 1045 1220 1395 1570
NC 20 20 20 20 30 34 38 43
600x1501.00
CFM 195 295 395 495 595 695 795 895
NC 20 20 20 21 27 31 35 40
600x2251.50
CFM 295 445 595 745 895 1045 1195 1345
NC 20 20 20 23 29 33 37 42
600x3002.00
CFM 395 595 795 995 1195 1395 1595 1795
NC 20 20 20 25 31 35 39 44
9 x 6
12 x 6
12 x 9
15 x 6
15 x 9
15 x 12
18 x 6
18 x 9
18 x 12
21 x 6
21 x 9
21 x 12
24 x 6
24 x 9
24 x 12
&Inches
EXCELAIR Air Outlets | Technical Catalogue
Performance DataCeiling Diffusers
Rectangular Ceiling Diffusers-Return[RCD-R]
Ceiling Diffusers | Performance Data
15
Performance DataCeiling Diffusers
Rectangular Ceiling Diffusers-Return[RCD-R]
EXCELAIR Air Outlets | Technical Catalogue
Four Way Airflow Pattern:
Size(mm) Neck Area
(Sq.ft)
Neck Velocity (fpm) 200 300 400 500 600 700 800 900
Velocity Pressure (w.g) .004 .007 .009 .014 .019 .025 .035 .045
Negative Static Pressure(in. w.g)
.039 .090 .163 .251 .378 .505 .663 .806
225x1500.375
CFM 72 111 147 185 222 260 297 332
NC 19 19 20 21 23 27 31 36
300x1500.500
CFM 90 140 190 240 290 340 390 440
NC 19 19 20 20 25 28 32 37
300x2250.750
CFM 145 220 295 370 445 520 595 670
NC 19 19 20 21 26 30 34 39
375x1500.625
CFM 127 190 252 315 376 440 502 565
NC 19 19 20 21 25 29 33 38
375x2250.938
CFM 185 276 370 464 558 651 745 840
NC 20 20 20 21 27 31 35 40
375x3001.25
CFM 245 370 495 620 745 870 995 1120
NC 20 20 20 23 29 33 37 42
450x1500.750
CFM 145 220 295 370 445 520 595 670
NC 20 20 20 20 26 30 36 39
450x2251.125
CFM 220 333 445 558 670 783 895 1007
NC 19 20 20 22 28 32 36 41
450x3001.50
CFM 295 445 595 745 895 1045 1195 1345
NC 20 20 20 24 30 34 38 43
525x1500.875
CFM 170 258 345 433 520 608 895 782
NC 20 20 20 20 26 30 34 39
525x2251.31
CFM 258 389 520 651 783 914 1045 1176
NC 20 20 20 20 28 32 36 41
525x3001.75
CFM 345 520 695 870 1045 1220 1395 1570
NC 20 20 20 20 30 34 38 43
600x1501.00
CFM 195 295 395 495 595 695 795 895
NC 20 20 20 21 27 31 35 40
600x2251.50
CFM 295 445 595 745 895 1045 1195 1345
NC 20 20 20 23 29 33 37 42
600x3002.00
CFM 395 595 795 995 1195 1395 1595 1795
NC 20 20 20 25 31 35 39 44
&(Inches)
9 x 6
12 x 6
12 x 9
15 x 6
15 x 9
15 x 12
18 x 6
18 x 9
18 x 12
21 x 6
21 x 9
21 x 12
24 x 6
24 x 9
24 x 12
B
A
B
A
Ceiling Diffusers | Stamped Square Ceiling Diffuser
16
Construction & Application
Assembling Features
Frames/ Blades Stamped Aluminium Sheets. (No joints / gaps at corners)
Finish Electrostatic Polyester powder coated system/ RAL code
Installation Ceiling or duct mounting
Shape Square
Diffusers are 4-way, discharges air equal in four horizontal direction.Frame and cores are from stamped Aluminium sheets.
Diffusers are cone type with individual cores manufactured from single piece of die-formedAluminium sheets.
Cores are assembled together and held in position by Aluminium pins loaded with steels springs.
Cores are easily removable and interchangeable to provide maximum flexibility in installation,maintenance and control of damper.
Aluminium opposite blade damper is fixed to the outer frame by Aluminium rivets.
Damper blades are separated from damper frame by means of Nylon bushes
Opposed blade damper is lever operated, accessible through face of the diffuser from below theceiling without need of any special tools. Screw operated damper as option is available.
Foam Gasket can be sealed around back of the frame as option to avoid air leakage.
EXCELAIR Air Outlets | Technical Catalogue
Stamped Square Ceiling Diffuser [SSCD]Ceiling Diffusers
Diffusers are used in all HVAC systems as a part of room air distribution sub – systems.
High level of comfort in indoor air flow and higher performance level can be achieved.
Ceiling Diffuser is known for its architectural appearance and solid construction along with an easy andeven air distribution, flow equalization, and maximum sound attenuation.
Easily removable internal assembly for cleaning or servicing, if necessary.
Inhibits dirt accumulation and offers negligible resistance to air flow.
Ceiling diffusers are efficient in handling high air volumes at a comparatively low noise levels to offer even disbursement of air.
Ceiling Diffusers | Dimensional Details
17
Standard Sizemm Inches A (mm) B (mm) C (mm) D (mm) E (mm)
150 x 150 6 x 6 131 144 290 45 85
225 x 225 9 x 9 207 220 365 45 85
300 x 300 12 x 12 278 294 440 45 85
375 x 375 15 x 15 355 369 515 45 85
450 x 450 18 x 18 430 444 595/600 45 85
Face Size C
Duct Size B
A
Ceiling Opening size = C - 20mm
D
E
Face Size C
D
Duct Size B
A
Without Damper With Damper
Ceiling Opening size = C - 20mm
Performance Data [SSCD]
Throw data in feet, based on isothermal air at 150 and 150 FPM terminal velocity
Noise Criteria ratings were determined by subtracting a room absorption of 10dB from the Sound Powder Level data.
Size(mm)
&(Inches)
Area Factor(AK)
Neck Area(Sq. ft.)
Neck Velocity (fpm)
Velocity Pressure in W.G.
CFM Total
Pt (In.w.g)
Throw/Side
NC (dB)
CFM Total
Pt (In.w.g)
Throw/Side
NC (dB)
CFM Total
Pt (In.w.g)
Throw/SideNC (dB)
CFM Total
Pt (In.w.g)
Throw/Side
NC (dB)
CFM Total
Pt (In.w.g)
Throw/Side
NC (dB)
150 x 150
6 x 6
225 x 225
9 x 9
300 x 300
12 x 12
375 x 375
15 x 15
450 x 450
18 x 18
Ak = 0.074
An=0.174
Ak = 0.164
An=0.444
Ak = 0.297
An=0.841
Ak = 0.435
An=1.361
Ak = 0.501
An=1.563
200
0.0013
36
0.0014
1-4
<15
90
0.0042
2-6
<15
168
0.0082
4-11
<15
287
0.0185
6-13
<15
345
0.024
7-14
<15
44
0.01
1.5-5
<15
111
0.012
3-8
<15
210
0.015
5-13
<15
349
0.0255
8-14
<15
417
0.0306
9-15
18
52
0.0174
2-6
<15
132
0.019
4-9
<15
252
0.022
6-14
<15
411
0.0326
9-15
16
489
0.038
11-16
20
61
0.028
3-7
<15
155
0.033
5-10
15
294
0.039
7-15
16
474
0.040
11-16
17
562
0.041
13-17
23
70
0.039
4-8
<15
178
0.046
6-11
17
336
0.055
9-16
18
536
0.059
13-20
19
633
0.062
15-21
25
87
0.061
5-9
15
222
0.072
7-13
19
420
0.088
11-18
25
661
0.098
15-21
28
777
0.103
17-22
30
105
0.082
6-11
16
267
0.098
9-15
22
504
0.121
13-20
29
786
0.137
17-22
33
921
0.145
19-23
34
122
0.103
7-12
17
310
0.124
10-16
24
588
0.154
15-22
33
911
0.176
19-24
36
1066
0.187
20-25
38
139
0.124
8-13
18
355
0.150
12-18
26
672
0.187
17-23
37
1036
0.214
21-25
39
1210
0.227
22-27
41
250 300 350 400 500 600 700 800
0.0028 0.0057 0.0087 0.0117 0.0117 0.0237 0.0298 0.0380
EXCELAIR Air Outlets | Technical Catalogue
Dimensional DetailsCeiling Diffusers
Ceiling Diffusers | Engineering Data
18
Engineering DataCeiling Diffusers
Extremely quiet environment, Suppressed speech is quite audible, Suitable for acute pickup of all sounds.
Very quiet office, suitable for large conferences; Telephone use satisfactory.
Quiet office; satisfactory for conference at a 15 ft. table; normal voice 10-30.ft.; telephone use satisfactory.
Satisfactory for conferences at a 6-8 ft. table; normal voice 6-12 ft.; telephone use satisfactory.
Satisfactory for conferences at a 4-5 ft. table; normal voice 3-6 ft.; raised voice 6-12 ft.; telephone use occasionally difficult.
Unsatisfactory for conferences of more than two or three persons; normal. Voice 1-2 ft.; raised voice 3-6 ft.; telephone use slightly difficult.
NCCurve
CommunicationEnvironment
TypicalOccupancy
Broadcasting studios, concert halls, music rooms.
Residences theatres, libraries, executive offices, director’s rooms
Private offices, schools, hotel rooms, court rooms, churches, hospital rooms.
General offices, labs, dining rooms.
Retail stores cafeterias, lobby areas, large drafting & engineering offices, reception areas
Computer rooms, stenographic pools, print machine rooms, process areas.
BelowNC 25
NC 30
NC 35
NC 40
NC 45
BelowNC 50
Sound DataDiffusers should be selected for recommended
NC rating or maximum Vk velocity for a specific
application. The engineering performance data
for specific diffuser type contains the NC rating
and Vk Outlet velocity.
Broadcasting studios 500
Residences 750
Apartments 750
Churches 750
Hotel bedroom 750
Legitimate theatres 1000
Private offices, acoustically treated 1000
Motion theatres 1250
Private office, not treated 1250
General offices 1500
Stores, upper floors 1500
Stores, main floors 1500
Industrial building 2000
Application Velocity Vk FPM
Damper Opening % Total pressure drop multiplier NC addition to diffuser rating
100
50
25
X1.0
X1.6
X2.7
+0
+7
+15
Closing the damper of ceiling diffuser, restricts the flow of air, thereby increasing the pressure drop and decreasing the cfm. In doing these things, the damper also generates sound which leads to increase in the NC level. Table above shows the NC addition of throttled dampers.
Table 1: Recommended NC Criteria
Table 2: Recommended MaximumVk Velocity
EXCELAIR Air Outlets | Technical Catalogue
Ceiling Diffusers | Engineering Data
19
How To Select, Size And Balancing
Selection Procedure:
The area to be served by a diffuser should be divided into equal squares. It is not necessary to locate outlet in the centerof discharge area, since 3 - way, 2 - way and 1 - way pattern style can be used to compensate for other location.1 - way opposite pattern style may be used for rectangular areas such as corridors.
Sizing Procedure:
1 -After selecting pattern style of diffuser required to properly cover the area to be conditioned, it is then necessary to be sure the outlet has been sized in accordance with length of throw, static pressure, velocity, and sound level to prevent any increase in environmental sound level from the diffuser and its accessories.
2- Using CFM per outlet as selected in method described in “Selection Procedure” above and select NC level from table 1 or recommended maximum Vk velocity from table 2 suitable for type of occupancy.
3- Select the proper size of diffuser from engineering performance data to meet your requirement.
4- If sizes other than those published are desired, consult factory.
5- Total pressure is indicated on performance data pages which is equal to sum of neck velocity pressure plus static pressure required.
Balancing Procedure:
For Square And Rectangular Diffusers:
To determine CFM use an Alnor Velometer with jet 2220-A tip positioned as shown in fig. 1. Take readings at pointsshown by dots (figures 2 through 6) on all active discharge sides. On larger sizes, over 24 x 24, take at leasttwo or three reading per active side and average the total readings to arrive at jet velocity Vk After selecting theproper Ak value from the engineering performance data, multiply the average velocity times the Ak to determine CFM.
Air Flow Rate Measurement
Velocity jet2220 A
FIG.2 FIG.3 FIG.4
FIG.6FIG.5FIG.1
EXCELAIR Air Outlets | Technical Catalogue
Engineering DataCeiling Diffusers
Ceiling Diffusers | Engineering Data
20
EXCELAIR Air Outlets | Technical Catalogue
Square & Rectangular Return Ceiling Diffusers
0
3 2½ 2 1½ 1 ½ 0
1 2 4 6 9 10
Combining Effects of Sound Sources
Octave Pass Bands in Cycles Per Second
45 - 90 - 180 - 355 - 710 - 1400 - 2800 - 5600 - 1120080
70
60
50
40
30
20
10 63 125 250 500 1000 2000 4000 8000
5 10 2 1000 2 5 10000
NC Curves
Oct
ave
Band
Sou
nd P
ress
ure
Leve
l in
dB R
E 0.
0002
Mic
roba
r (L
p)
Oct
ave
Band
Sou
nd P
ress
ure
Leve
l in
dB R
E 10
-12
wat
t (L
w)
Frequency - Hz
Approximate Threshold of Hearing
for Continuous Noise NC 10
Difference between two sources to be combined (dB)
Number to be added to higher level to obtain combined effect (dB)
Engineering DataCeiling Diffusers
Ceiling Diffusers | Engineering Data
21
Engineering DataCeiling Diffusers
EXCELAIR Air Outlets | Technical Catalogue
10.000
10.000
9.000
9.000
8.000
8.000
7.000
7.000
6.000
6.000
5.000
5.000
4.000
4.000
3.500
3.500
3.000
3.000
2.500
2.500
2.000
2.000
1.800
1.600
1.600
1.400
1.400
1.200
1.200
1.000
1.000
900
900
800
800
700
700
600
600
500
500
400
400
350
350
300
300
280260240220200
180
160
140
120
100 170
200
250
450
1.100
1.700
4.500
11.00012.000
14.000
17.000 10.0
9.0
8.0
7.0
6.0
5.0
4.0
3.5
3.0
2.5
2.01.8
1.6
1.4
1.2
1.0
.9
.8
.7
.6
.5
.4
.35
.3.28.26.24.22.2
.18
.16
.14
.12
1 2.54
3.0
3.5
4.5
5.0
6.0
7.0
8.0
9.010.0
12.0
14.0
16.0
18.020.0
22.0
25.4
30.0
35.0
40.0
45.050.0
60.0
70.0
80.0
90.0100.0
120.0
140.0
160.0
180.0200.0
220.0
254.0
Air Flow Conversion Pressure Conversion
C.F.M m3/h INS. mm.
Assembly rooms 4 - 8Bakeries 20 - 30Banks/Building societies 4 - 8Bathrooms 6 - 10Bedrooms 2 - 4Billiard rooms 6 - 8Boiler rooms 15 - 30Cafes and coffee bars 10 - 12Canteens 8 - 12Cellars 3 - 10Churches 1 - 3Cinemas and theatres 10 - 15Club rooms 12 minimumCompressor rooms 10 - 12Conference rooms 8 - 12Dance halls 12 minimumElectroplating shops 10 - 12Engine rooms 15 - 30Entrance halls, corridors 3 - 5Factories and workshops 8 - 10Foundries 15 - 30Garages 6 - 8Glasshouses 25 - 60Gymnasiums 6 minimumHairdressing salons 10 - 15Hospitals - sterilizing 15 - 25Kitchens - domestic 15 - 20 - commercial 30 minimumLaboratories 6 - 15Laundries 10 - 30Lavatories 6 - 15Lecture theatres 5 - 8Libraries 3 - 5Living rooms 3 - 6Offices 6 - 10Paint shops (not cellulose) 10 x 20Photo and X-ray darkrooms 10 - 15Public house bars 12 minimumRecording control rooms 15 - 25Recording studios 10 - 12Restaurants 5 - 7Schoolrooms 5 - 7Shops and supermarkets 8 - 5Shower baths 15 - 20Stores and warehouses 3 - 6Squash courts 4 minimumSwimming baths 10 - 15Utility rooms 15 - 20Welding shops 15 - 30
Airflow / Pressure Conversion ChartRecommended Air Changes Per Hour
(For Ventilation)
Increase by 50% where heavy smoking occurs or if the room is
in underground.
Ceiling Diffusers | Quick Selection Tables
22
EXCELAIR Air Outlets | Technical Catalogue
Square Ceiling Diffusers
Rectangular Ceiling Diffusers
Dimensions
Size (mm) CFM Range
225 x 150
300 x 150
300 x 225
375 x 150
375 x 225
375 x 300
450 x 150
75 - 335
100 - 450
150 - 675
152 - 560
190 - 845
250 - 1125
150 - 675
Dimensions
Size (mm) CFM Range
450 x 225
450 x 300
525 x 150
525 x 225
600 x 150
600 x 225
600 x 300
225 - 1010
300 - 1350
175 - 785
260 - 1180
200 - 900
300 - 1350
400 - 1800
Size (mm) CFM Range
150 x 150
225 x 225
300 x 300
375 x 375
450 x 450
525 x 525
600 x 600
50 - 225
100 - 500
200 - 900
300 - 1400
450 - 2000
600 - 2750
800 - 3600
Dimensions
Dimensions Dimensions
Quick Selection TablesCeiling Diffusers
Ceiling Diffusers | Installation
23
EXCELAIR Air Outlets | Technical Catalogue
97 mm
Listed Size
Ceiling Opening=Listed Size + 89mm
Listed Size + 140mm
30mm 60mm
30O
OBD
Connected to Duct
Connected to Plenum Box
Rested in False Ceiling
Duct
Ceiling Level
Visible Ceiling Level
Ceiling Level
False Ceiling Level
Ceiling Level
False Ceiling Level
InstallationCeiling Diffusers
Ceiling Diffusers | Product Testing
24
EXCELAIR Air Outlets | Technical Catalogue
Test Method
Introduction
According to the ETL - Intertek Testing Laboratories Inc the given performance tables includes the test results conducted on three Supply Air Diffusers with Damper.The result includes static pressure, area factor, throw and sound power level.The samples were selected and supplied by Century Mechanical Systems Factory in April 12, 2010. Extrapolations and Interpolations were applied to cover all range of sizes and parameters.
The Samples were tested in accordance with the ASHRAE 70-2006 Standard “Method of Testing for Rating the Performance of Air Outlets and Inlets, which incorporates ADC 1062: GRD-84 test code for Grilles, Registers and Diffusers. Acoustical data were obtained employing a Bruel & Kjaer Digital Frequency Pulse Analyzer and analyzed on a Compaq Computer. The reference sound source used for this test was a calibrated Bruel & Kjaer Type 4204, which conforms to the above standard. The sample was installed in the facility and supplied with measured volumes of air. The static pressure was measured 1 ½ duct diameters upstream of the inlet.
Noise Criteria (NC) ratings were determined by subtracting a room absorption of 10dB from the Sound Powder Level data. Air volumes were calculated in CFM. Throw values were derived at terminal velocities of 150fpm, 100fpm and 50fpm.
Product testingCeiling Diffusers
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EXCELAIR Air Outlets | Technical Catalogue
1. Type Square Ceiling Diffuser - Supply SCD-SSquare Ceiling Diffuser - Return SCD-RRectangular Ceiling Diffuser - Supply RCD-SRectangular Ceiling Diffuser - Return RCD-RStamped Square Ceiling Diffuser - Supply SSCD-SStamped Square Ceiling Diffuser - Return SSCD-R
2. Air Flow Patterns One Way Air Flow Pattern 1WTwo Way Air Flow Pattern 2W Three Way Air Flow Pattern 3WFour Way Air Flow Pattern 4W
3. Number Of Units Nos
4. Size WxH
5. Accessories Equalizing Grid ESquare to Round Neck Adapter S-RSquare to Square Neck Adapter S-S
6. Colour Standard Colour RAL9010Mill Finish M Other Colour (RAL CODE)
SCD - S 4 W 50 150 x 150 mm S-S RAL 9010
150 X 150 mm, 50 units of Square Ceiling Diffuser-Supply , 4way, with square to square adapter, RAL 9010 finish.
Example
Ordering RequisitesCeiling Diffusers
1 2 3 4 5 6
Ceiling Diffusers | Notes
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EXCELAIR Air Outlets | Technical Catalogue
NotesCeiling Diffusers
Ceiling Diffusers | Notes
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EXCELAIR Air Outlets | Technical Catalogue
NotesCeiling Diffusers
Ceiling Diffusers | Notes
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EXCELAIR Air Outlets | Technical Catalogue
NotesCeiling Diffusers
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EXCELAIR GD1000 SERIES Available in RAL 9010 & 9016 Colors.
All other colors are available on request.
Coyright
Tel: +971 4 3416337, Fax : +971 4 3416338P.O Box: 60270, Dubai, United Arab [email protected]
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