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.

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. Having an understanding of this makes choosing the correct fan size for your home an easier process. 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. Choose a fan that matches your home or attic s size for optimal performance.

Attic fan size calculation. Example 20 wide by 50 long attic. Cubic feet per minute or cfm is the amount of cubic feet of air per minute the fan moves. Quietcool attic fans work almost everywhere almost anytime.

Too low of a cfm and you. 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. Whole house fans come in a variety of sizes determined by the amount of air they circulate or whole house fan 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. Understanding whole house fan cfm. The formula above gives an approximate value of the cfm needed for an attic fan. During the summer an attic can be 40 to 50 hotter than the outside temperature which in turn heats up the house very quickly.

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. Cfm cubic feet per minute is a measure of the amount of air the fan moves in a minute. Too high of a cfm and you ll be spending more money running the fan than you should be. Help determine optimal sizing of solar attic fans.

How to size a whole house attic fan.