How To Size An Attic Exhaust Fan
10 feet x 12 feet x 8 feet that computes to 960 cubic feet of air in the room.
How to size an attic exhaust fan. You multiply length times width times height. The minimum requirements say that this air should be changed 15 times an hour. This attic ventilation calculator computes the size and number of solar powered attic fans to achieve the proper ventilation for your attic. 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. You now need to multiply 960 x 15. 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.
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. Cfm cubic feet per minute is a measure of the amount of air the fan moves in a minute. Measure the distance between the studs on the left and right side of your vent.
Use a tape measure to get an accurate measurement.