I am now a believer in powered attic ventilation.
Sizing an attic fan.
Cfm cubic feet per minute is a measure of the amount of air the fan moves in a minute.
How to size a whole house 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.
A whole house attic fan is installed in the ceiling between the top floor and the attic as a supplement to air conditioning.
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.
However i think the fan sizing above is excessive.
Help determine optimal sizing of solar attic fans.
A whole house fan sucks warm house.
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.