Kitchen Ventilation
Systems
Multi Point Ventilation
Heat Recovery Ventilator
Bath Ventilation
Bathroom Exhaust Fans
Bathroom Exhaust Fans
CODE for Baths without bathing or spas:
3 SF Glazing ½ Operable or
Baths 75SF or less - 50 CFM Fan or Over 75 SF – Intermittent Ventilation
System 1 air change every 12 minutes or
Continuous Ventilation System at 20 CFM
Bathroom Exhaust Fans
Baths with bathing and spas
50 CFM Intermittent
or
20 CFM Continuous
Multi Point Ventilation
Kitchen Ventilation Considerations
Fan Type Propeller Fan – Limited air capacity
and noisy
Axial Fan – Better air movement but still noisy
Centrifugal Blower (Squirrel Cage) The best
Axial Fan
Centrifugal Blower
Sound Levels
Sound is measured in Sones
1-Sone equals the loudness of a pure tone having a frequency of 1,000 hertz at 40 decibels.
Decibels
0 The softest sound a person can hear with normal hearing
10 normal breathing 20 whispering at 5 feet 30 soft whisper 50 rainfall 60 normal conversation 110 shouting in ear 120 thunder
Sones
The Home Ventilation Institute sets a limit of 9.0 sones for kitchen fans up to 500 CFM
Reference – A fan with a sone rating of 8.0 sones is twice as loud as one rated at 4.0 sones.
Reference - Refrigerators run at about 1.0 sone.
Broan Silent Series 110 cfm .7 Sones
In-Line Ventilator Fan 110 CFM 1.0 Sones 210 CFM 2.0 Sones
Kitchen Ventilation
Kitchen Exhaust Fans
CODE100 CFM IntermittentOr25 CFM Continuous
Multi Point Ventilation
Vented Hood System
Recirculating Fan in Microwave Combo
Kitchen Ventilation
Heat Grease Steam Odor Smoke
Recirculating Range Hood
Recirculating Ventilation System
This type of system will only remove two Heat Steam
Downdraft
Down Draft Ventilation
Down Draft Ventilation
Range Hood Installation
Integral Fan Vented Through Roof
In Line Fan
Integral Through Soffit
Remote Ventilator
Through Crawlspace
Down Draft Through Floor
Down Draft Through Roof
Kitchen Ventilation Considerations
Fan – 250 CFM minimum Ducts Duct run lengths
Interior Fan (power) Keep duct runs as short and straight
as possible. 6” round or 3 ¼” x 10 rectangular
ducts Maximum run = 25’ maximum
Kitchen Ventilation Considerations
Exterior or In-Line Fan (power) 9” round or 3 ¼” x 14” rectangular
duct Maximum run = 55’ maximum