How To Size Solar Attic Fan

Alternatively for more precise calculations you can provide your actual floor area.

How to size solar attic fan.

Whole house fans work on the principle of removing the hot and humid air out of the house. The higher the cfm cubic feet per minute the more airflow a fan can produce. 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. Ft of your home by 0 7 will give you an approximate minimum cubic feet of air a fan should be able to move per minute.

Use this estimator to help figure out how many attic fans you will need. It helps to cool your home temperatures and the attic by approximately 30 degrees. Choose a fan that matches your home or attic s size for optimal performance. If you do this you don t need to enter a length or width.

Help determine optimal sizing of solar attic fans. To start enter the length width and height of your attic. How to size solar attic exhaust vent fans so we developed our solar powered attic fan sizer calculator. Attic fan size calculator this attic ventilation calculator computes the size and number of solar powered attic fans to achieve the proper ventilation for your attic.

Vent fan size 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. Too high of a cfm and you ll be spending. A steep roof will increase internal attic volume and a dark roof will increase energy absorption from the sun. The warm air escapes through the attic and to the attic vents allowing the circulation of chilly air from the windows.

Cfm cubic feet per minute is a measure of the amount of air the fan moves in a minute. The formula above gives an approximate value of the cfm needed for an attic fan. The whole house fan is installed inside the attic between the living space and ceiling.