Attic Fan Sizing

This attic ventilation calculator computes the size and number of solar powered attic fans to achieve the proper ventilation for your attic.

Attic fan sizing.

Whole house fans come in a variety of sizes determined by the amount of air they circulate or whole house fan cfm. Having an understanding of this makes choosing the correct fan size for your home an easier process. The formula above gives an approximate value of the cfm needed for an attic fan. 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.

With an attic fan you can cool the attic to the same temperature as it is outside greatly reducing the house from heating as quickly. Example 20 wide by 50 long attic. How to size a whole house attic fan. Help determine optimal sizing of solar attic fans.

20 x 50 1 000 sq. Quietcool attic fans work almost everywhere almost anytime. 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.

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. Attic fan size calculation. Understanding whole house fan cfm.

Too low of a cfm and you. Too high of a cfm and you ll be spending more money running the fan than you should be. Next multiply the square feet of attic space by 0 7 to get the minimum number of cubic feet of air per minute that the fan should be rated to move. How to size solar attic exhaust vent fans so we developed our solar powered attic fan sizer calculator.

During the summer an attic can be 40 to 50 hotter than the outside temperature which in turn heats up the house very quickly.