These are the two most common methods used to evaluate the ventilation needs of a house:
CSA F326 and Canadian Building Code:
• 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:
6
Master
Bedroom
Bedroom #1
Kitchen
Basement
Bedroom
#2
Bedroom
#3
Living room
Bathroom
#3
Dining room
VH0021A
Family room
Bathroom
#1
Bathroom
#2
Laundry
room
1320 ft
2
1320 ft
2
Method 1
CSA F326
Kitchen (10 cfm)
Dining room (10
cfm)
Living room (10
cfm)
Family room (10
cfm)
Master bedroom (20
cfm)
Bedroom #1 (10
cfm)
Bedroom #2 (10
cfm)
Bedroom #3 (10
cfm)
Bathroom #1 (10
cfm)
Bathroom #2 (10
cfm)
Bathroom #3 (10
cfm)
Laundry room (10
cfm)
Basement (20 cfm)
Total 150
cfm
Method 2
ASHRAE Standard 62-2001
Volume of basement 10560 ft
3
Volume of main floor 10560 ft
3
Volume of second floor 10560 ft
3
Total volume 31680 ft
3
x .35/h
11090 ft
3
/h
÷ 60 (min/h)
Total 185 cfm (high speed)
1320 ft
2
Second floor
Main floor
Basement
2.0 Sizing
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