Attic Fan Sizing

Attic fan size calculation.

Attic fan sizing.

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

Example 20 wide by 50 long attic. Understanding whole house fan cfm. 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. 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.

Cfm cubic feet per minute is a measure of the amount of air the fan moves in a minute. 20 x 50 1 000 sq. A whole house attic fan is installed in the ceiling between the top floor and the attic as a supplement to air conditioning. Too high of a cfm and you ll be spending more money running the fan than you should be.

Quietcool attic fans work almost everywhere almost anytime. This attic ventilation calculator computes the size and number of solar powered attic fans to achieve the proper ventilation for your attic. Help determine optimal sizing of solar attic fans. Too low of a cfm and you.

How to size a whole house attic fan. 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 value of the cfm needed for an attic fan. Cubic feet per minute or cfm is the amount of cubic feet of air per minute the fan moves.

Choose a fan that matches your home or attic s size for optimal performance.