Simultaneously cool fresh air will be pulled through the open windows and circulated through every room effectively replacing all of the air in your home and minimizing your dependence on air conditioning.
Sizing an attic fan.
I am now a believer in powered attic ventilation.
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.
However i think the fan sizing above is excessive.
Cfm cubic feet per minute is a measure of the amount of air the fan moves in a minute.
A whole house fan sucks warm house.
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.
Help determine optimal sizing of solar attic fans.
How to size solar attic exhaust vent fans so we developed our solar powered attic fan sizer calculator.
A whole house attic fan is installed in the ceiling between the top floor and the attic as a supplement to air conditioning.