How To Size An Attic Exhaust Fan

The formula above gives an approximate value of the cfm needed for an attic fan. That translates to one attic vent 3 feet by 3 feet or two attic vents. Use a tape measure to get an accurate measurement.

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How To Size Attic Exhaust Vent Fans For Your Home

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To determine the size of your attic multiply the width by the length of the attic floor in feet.

How to size an attic exhaust fan.

Next multiply the square feet of attic space by 0 7 to get the minimum number of cubic feet of air per. If you need 6 000 cfm of air flow through your house divide 6 000 by 750 to get a minimum 8 square feet of attic venting. 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. You now need to multiply 960 x 15.

Cfm cubic feet per minute is a measure of the amount of air the fan moves in a minute. The minimum requirements say that this air should be changed 15 times an hour. Measure the distance between the studs on the left and right side of your vent. 10 feet x 12 feet x 8 feet that computes to 960 cubic feet of air in the room.

You multiply length times width times height. How to size attic exhaust vent fans for your home attic size. Some professionals multiply the square feet value with 0 6 instead of 0 7. This attic ventilation calculator computes the size and number of solar powered attic fans to achieve the proper ventilation for your attic.

When you re finished write the number down somewhere you ll need it to find the right size piece of plywood for your attic fan to be installed on.

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