Attic Gable Fan Sizing

Most manufacturers will provide you with the maximum attic size for your fan model.

Attic gable fan sizing. When buying an attic fan look at the cfm rating cfm is the amount of air that is stirred in sixty seconds. After attic fan installation ac still off during day. For a single story house this is usually the same as the square footage of the house itself plus any attached garage area. During workdays would leave air conditioner off when leaving in the morning.

This was observed on numerous days following the installation. To determine the size of your attic multiply the width by the length of the attic floor in feet. Temp 84f at 5pm. Federal housing authority recommends a minimum of at least 1 square foot of attic ventilation evenly split between intake and exhaust for every 300 square feet of attic floor space.

Temp 92 f at 5pm. Attic fan size calculation 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. Example 20 wide by 50 long attic. The attic fan kept my house cooler by 8f compared to pre fan installation days.

Good insulation reduces fan effectiveness. 20 x 50 1 000 sq. One static vent style is the turbine vent which uses wind to power its enclosed fan all it takes is a light breeze to rotate the blades and suck heat out of the attic view example on the home. Proper attic ventilation consists of a balance between air intake at your eaves soffits or fascias and air exhaust at or near your roof ridge.

How to size solar attic exhaust vent fans so we developed our solar powered attic fan sizer calculator. 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. How to pick the best attic fan for your gable vent.

Attic ventilation fans whether hard wired or powered by their own solar panels seem like a low cost and effective way to help keep your house cool. However the utility of attic ventilation fans is actually quite a controversial topic. Best bang for the buck.