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2.0
Sizing
These are the two most common methods used to evaluate the ventilation needs of a house:
CSA F326 and Canadian Building Code:
ASHRAE Standard 62-2001:
Refer to ventilation code of your area to determine which method to use.
Example:
Second floor
Master
Bedroom
Bedroom #1
VH0021A
CSA F326
Kitchen
Dining room
Living room
Family room
Master bedroom
Bedroom #1
Bedroom #2
Bedroom #3
Bathroom #1
Bathroom #2
Bathroom #3
Laundry room
Basement
Total
• High speed:
10 cfm per room
20 cfm for the master bedroom and the basement
• Low speed: 40-60% of high speed
• 0.35 air change per hour
Bedroom
#2
Bedroom
#3
1320 ft
2
Basement
Basement
cfm
(10
)
cfm
(10
)
cfm
(10
)
cfm
(10
)
cfm
(20
)
cfm
(10
)
cfm
(10
)
cfm
(10
)
cfm
(10
)
cfm
(10
)
cfm
(10
)
cfm
(10
)
cfm
(20
)
cfm
150
(high speed)
6
Main floor
Living room
Family room
1320 ft
2
ASHRAE Standard 62-2001
Volume of basement
Volume of main floor
Volume of second floor
Total volume
Total
Laundry
room
Kitchen
Dining room
1320 ft
2
10560 ft
3
10560 ft
3
10560 ft
3
31680 ft
3
x .35/h
11090 ft
3
/h
÷ 60 (min/h)
cfm
185
(high speed)
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Troubleshooting
