A fan sized using the above formula would cause 10 to 30 air exchanges per hour depending on the height of the attic more than the recommendation for a steam filled bathroom.
Sizing an attic fan.
A whole house fan sucks warm house.
The formula above gives an approximate.
By sizing and implementing a whole house fan you can pull the warm stale air from your entire home into the attic where it s vented outside.
I am now a believer in powered attic ventilation.
Attic fan size calculation attic fan size cfm 0 7 x sq ft area of the attic formula 1 the size of an attic fan is calculated in terms of cfm.
How to size solar attic exhaust vent fans so we developed our solar powered attic fan sizer calculator.
This attic ventilation calculator computes the size and number of solar powered attic fans to achieve the proper ventilation for your attic.
A whole house attic fan is installed in the ceiling between the top floor and the attic as a supplement to air conditioning.
However i think the fan sizing above is excessive.
How to size a whole house attic fan.