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How to size a whole house attic fan.
Sizing an attic fan. 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. 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. The formula above gives an approximate. A whole house fan sucks warm house.
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. Help determine optimal sizing of solar attic fans. However i think the fan sizing above is excessive. 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. I am now a believer in powered attic ventilation.
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