How to size a whole house attic fan.
Sizing an attic fan.
The formula above gives an approximate.
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.
This attic ventilation calculator computes the size and number of solar powered attic fans to achieve the proper ventilation for your attic.
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.
A whole house attic fan is installed in the ceiling between the top floor and the attic as a supplement to air conditioning.
Help determine optimal sizing of solar attic fans.
Cfm cubic feet per minute is a measure of the amount of air the fan moves in a minute.
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.
I am now a believer in powered attic ventilation.