How To Size Solar Attic Fan

The whole house fan is installed inside the attic between the living space and ceiling.

How to size solar attic fan.

The higher the cfm cubic feet per minute the more airflow a fan can produce. Whole house fans work on the principle of removing the hot and humid air out of the house. Help determine optimal sizing of solar attic fans. Attic x 0 7 700 cfm minimum fan rating add an additional 20 cfm x 1 20 if you have a steep roof and 15 cfm x 1 15 for a dark roof.

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. Solar attic fan sizing calculator. The warm air escapes through the attic and to the attic vents allowing the circulation of chilly air from the windows. How to size solar attic exhaust vent fans so we developed our solar powered attic fan sizer calculator.

Choose a fan that matches your home or attic s size for optimal performance. It helps to cool your home temperatures and the attic by approximately 30 degrees. 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. Cfm cubic feet per minute is a measure of the amount of air the fan moves in a minute.

Alternatively for more precise calculations you can provide your actual floor area. 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. To start enter the length width and height of your attic. Too high of a cfm and you ll be spending.

Fan size most attics are around the same square footage as your home. Use this estimator to help figure out how many attic fans you will need. The formula above gives an approximate value of the cfm needed for an attic fan.