Introduction: FDDKrueger’s FDD round displacement diffusers are designed to seamlessly integrate into any underfloor installation and can supplement a displacement ventilation system. The FDD provides high flow capabilities that exceed the competition. The units are made of a durable and long lasting cast aluminum construction. The FDD is available in a variety of sizes and plenum options. The plenums are pre-painted flat black to conceal them from view through the diffuser.
MODEL FDD - Cast Aluminum Round Diffuser for Underfloor with Displacement Air Pattern
FEATURES• Available in a 4”, 6”, 8” or 10” round nominal size.• Ships completely assembled and is easily installed.• 180° displacement air pattern on 4” and 6”.• 360° displacement air pattern on 8” and 10”.• Durable cast aluminum construction to withstand any application.• Features a 1250 lbs. load rating.• Manual airflow adjustment.• Conforms to NFPA 90A fire requirements.• Provided with optional factory painted flat black steel plenum
on sizes 8” and 10”.• Provides silent operation less than 17NC at 100% capacity.• When ordered alone, works in 6” raised floors.
With plenum option, compatible with 8” raised floors.
PLENUM OPTIONS0 - No plenum for constant volume. P - Open inlet to underfloor plenum for constant volume.D - Elliptical inlet to accept a 6” round compressed duct
connection.V - VAV inlet with 0-10 Vdc proportional actuator.H - Heat/Cool changeover unit has an elliptical inlet to
accept a 6” round compressed duct connection on one side that is ducted to a underfloor fan powered terminal unit. On the adjacent side is a VAV inlet with 0-10 Vdc proportional actuator for cooling operation.
NOTE: Units with the V and H plenum options ship with a quick connect cable for both data and power.
STANDARD FEATURES• Cast aluminum diffuser face.• Displacement air pattern.• 1250 lbs. maximum load rating.• Complies with NFPA 90A.• Manual air flow adjustment with
sliding damper plate.• Welded and riveted pre-painted
STANDARD FEATURES• Cast aluminum diffuser face.• Displacement air pattern.• 1250 lbs. maximum load rating.• Complies with NFPA 90A.• Manual air flow adjustment with
sliding damper plate.• Welded and riveted pre-painted
STANDARD FEATURES• Cast aluminum diffuser face.• Displacement air pattern.• 1250 lbs. maximum load rating.• Complies with NFPA 90A.• Manual air flow adjustment with
sliding damper plate.• DC synchronized magnetic motor.• Welded and riveted pre-painted
galvanized steel.• Multi-function circuit board for
varying control strategies.• Tight shut-off.• One (1) PAP-1 cable provided with
STANDARD FEATURES• Cast aluminum diffuser face.• Displacement air pattern.• 1250 lbs. maximum load rating.• Complies with NFPA 90A.• Manual air flow adjustment with
sliding damper plate.• DC synchronized magnetic motor.• Welded and riveted pre-painted
galvanized steel.• Multi-function circuit board for
varying control strategies.• Tight shut-off.• One (1) PAP-1 cable provided with
STANDARD FEATURES• Cast aluminum diffuser face.• Displacement air pattern.• 1250 lbs. maximum load rating.• Complies with NFPA 90A.• Manual air flow adjustment with
sliding damper plate.• Welded and riveted pre-painted
STANDARD FEATURES• Cast aluminum diffuser face.• Displacement air pattern.• 1250 lbs. maximum load rating.• Complies with NFPA 90A.• Manual air flow adjustment with
sliding damper plate.• Welded and riveted pre-painted
FDD Dimensional Information, Features, and OptionsFDD-V, FACE AND SIDE VIEWS, SIZE 8
6.875”
12.5”
14.25”
8.25ӯ
16.25”
8”
9.5ӯ
8ӯ
PLENUM TOP VIEW
SIDE VIEW
360° AIR PATTERN (ONLY)
STANDARD FEATURES• Cast aluminum diffuser face.• Displacement air pattern.• 1250 lbs. maximum load rating.• Complies with NFPA 90A.• Manual air flow adjustment with
sliding damper plate.• DC synchronized magnetic motor.• Welded and riveted pre-painted
galvanized steel.• Multi-function circuit board for
STANDARD FEATURES• Cast aluminum diffuser face.• Displacement air pattern.• 1250 lbs. maximum load rating.• Complies with NFPA 90A.• Manual air flow adjustment with
sliding damper plate.• DC synchronized magnetic motor.• Welded and riveted pre-painted
galvanized steel.• Multi-function circuit board for
varying control strategies.• Tight shut-off.• One (1) PAP-1 cable provided with
1. SERIES: (XXX) FDD - Cast Aluminum Round Diffuser for Underfloor with Displacement Air Pattern
2. THROW PATTERN: (X) H - 180° Air Pattern* F - 360° Displacement Air Pattern**
3. SIZE: (XX) 4”, 6”, 8”, or 10”
4. PLENUM OPTION: (X) 0 - None D - 6” Ellipsoid Duct Connection P - Plenum Opening for Constant Volume V - VAV Air Valve H - VAV Air Valve with 6” Ellipsoid Duct Connection
5. FINISH: (X) A - Black (RAL 9011) B - Gray (RAL 7012) C - Antique Copper (09/90180) D - Silver Hammertone (09/90250) E - Antique Gray (09-90170) F - Putty (RAL 9002) G - Beige (RAL 1019) H - Antique Gold (09/90200) I - Antique Silver (09/90190) J - Dark Brown (RAL 8014) X - Custom (Provide RAL Number)
* 180° air pattern available on sizes 4” and 6”.** 360° air pattern available on sizes 8” and 10”.
FDDUnderfloor diffusers shall be Krueger model FDD. The diffuser shall be constructed of solid cast aluminum and meet NFPA 90A requirements. The FDD diffuser shall have a maximum load rating of 1250 lbs. The diffuser, damper assembly, and dirt catch pan are shipped fully assembled and can be securely installed in floor tile by turning the center screw and allow retention bar to clip to bottom side of floor tile. The diffuser shall not be removed without use of hexagonal key. The FDD floor diffuser shall be designed such that the access floor panel is not removed from the floor system for installation of the diffuser. The diffuser core design shall produce a low displacement air pattern that complies with ASHRAE Standard 62. The diffuser shall have a sliding manual damper capable of adjusting the volume from full closed to full open. The FDD diffuser shall be factory painted with a powder coat finish.
The FDD-D shall be provided with an optional plenum. The plenum shall be factory painted flat black and be a minimum of 20 gauge galvanized steel and shall support all diffuser components. The plenum shall be provided with an ellipsoid duct connection that will accept a standard six inch duct.
The FDD-P shall be provided with an optional plenum. The plenum shall be factory painted flat black and be a minimum of 20 gauge galvanized steel and shall support all diffuser components. The plenum shall be provided with one side open to the underfloor plenum for constant volume operation and to control sound transmission from the underfloor plenum to the occupied zone.
The FDD-V shall be provided with an optional plenum. The plenum shall be factory painted flat black and be a minimum of 20 gauge galvanized steel and shall support all diffuser components. The plenum shall be provided with a an actuated air valve damper controlled by a 90-degree stepper type motor having no stops, springs, gears, belts or linkages, and shall rotate continuously in one direction (not reversing) to minimize wear. The motor shall directly drive the damper blade. The damper assembly shall be rated and tested for a life of 100 million cycles (factory tests of at least 20 million cycles at normal operating speeds are required). A proportional 0-10 Vdc control signal can be used to modulate the damper position to adjust the volume of air in response to the thermostat signal.
The FDD-H shall be provided with an optional plenum. The plenum shall be factory painted flat black and be a minimum of 20 gauge galvanized steel and shall support all diffuser components. The plenum shall be provided with an ellipsoid duct connection that will accept a standard six inch duct. The plenum shall be provided with an actuated air valve damper controlled by a 90-degree stepper type motor having no stops, springs, gears, belts or linkages, and shall rotate continuously in one direction (not reversing) to minimize wear. The motor shall directly drive the damper blade. The damper assembly shall be rated and tested for a life of 100 million cycles (factory tests of at least 20 million cycles at normal operating speeds are required). A proportional 0-10 Vdc control signal can be used to modulate the damper position to adjust the volume of air in response to the thermostat signal.
