Attic Gable Fan Sizing

Gable fans will be rated for a certain amount of free space ventilation.

Attic gable fan sizing.

For a single story house this is usually the same as the square footage of the house itself plus any attached garage area. This model can be installed through the wall. Building codes vary. Always have a balanced ventilation system.

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. This was observed on numerous days following the installation. After attic fan installation ac still off during day. Temp 84f at 5pm.

20 x 50 1 000 sq. This indicates the amount of ventilation area independent of the gable opening where the fan is installed. During workdays would leave air conditioner off when leaving in the morning. The attic fan kept my house cooler by 8f compared to pre fan installation days.

Cfm cubic feet per minute is a measure of the amount of air the fan moves in a minute. If you ve got access to your attic s gables iliving s gable mount fan is a great option for moving some air without having to cut a hole in your roof. In order to facilitate this exchange of warm and cool air the general rule of thumb suggests installing at least 1 sq. The opening of the boom mouth must be large enough for the attic fan to consume the hot air from the attic.

Example 20 wide by 50 long attic. To determine the size of your attic multiply the width by the length of the attic floor in feet. How to size solar attic exhaust vent fans so we developed our solar powered attic fan sizer calculator. Help determine optimal sizing of solar attic fans.

The formula above gives an approximate value of the cfm needed for an attic fan. Of vent for every 300 sq.