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