Attic Fan Sizing

How to size solar attic exhaust vent fans so we developed our solar powered attic fan sizer calculator.

Attic fan sizing.

The formula above gives an approximate value of the cfm needed for an attic fan. Whole house fans come in a variety of sizes determined by the amount of air they circulate or whole house fan cfm. Too high of a cfm and you ll be spending more money running the fan than you should be. 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.

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. 20 x 50 1 000 sq. Cfm cubic feet per minute is a measure of the amount of air the fan moves in a minute. 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.

Cubic feet per minute or cfm is the amount of cubic feet of air per minute the fan moves. Attic fan size calculation. How to size a whole house 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.

A whole house attic fan is installed in the ceiling between the top floor and the attic as a supplement to air conditioning. Having an understanding of this makes choosing the correct fan size for your home an easier process. This attic ventilation calculator computes the size and number of solar powered attic fans to achieve the proper ventilation for your attic. Too low of a cfm and you.

Choose a fan that matches your home or attic s size for optimal performance. 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. Help determine optimal sizing of solar attic fans.

A whole house fan sucks warm house.