3
These are the two most common methods used to evaluate the ventilation needs of a house:
CSA F326:
• High speed: 10 cfm per room
20 cfm for the master bedroom and the basement
• Low speed: 40-60% of high speed
ASHRAE Standard 62-2001:
• 0.35 air change per hour
Refer to ventilation code of your area to determine which method to use.
Example:
CSA F326
Kitchen (10 cfm)
Dining room (10 cfm)
Living room (10 cfm)
Master bedroom (20 cfm)
Bedroom #1 (10 cfm)
Bedroom #2 (10 cfm)
Bedroom #3 (10 cfm)
Washroom #1 (10 cfm)
Washroom #2 (10 cfm)
Basement (20 cfm)
Total 120 cfm (high speed)
ASHRAE Standard 62-2001
Volume of basement (7,360 ft
3
)
Volume of main floor (7,360 ft
3
)
Volume of second floor (7,360 ft
3
)
Total volume (22,080 ft
3
)
x .35
7,728 ft
3
/hr
÷ 60 (min/hr)
Total 129 cfm (high speed)
1.0 Sizing
NOTE: The high speed ventilation capacity of the unit should correspond to at least the higher of these two total values.
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