Attic Gable Fan Sizing

This attic ventilation calculator computes the size and number of solar powered attic fans to achieve the proper ventilation for your attic.

Attic gable fan sizing.

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. For a single story house this is usually the same as the square footage of the house itself plus any attached garage area. In order to facilitate this exchange of warm and cool air the general rule of thumb suggests installing at least 1 sq.

To determine the size of your attic multiply the width by the length of the attic floor in feet. 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. How to size solar attic exhaust vent fans so we developed our solar powered attic fan sizer calculator.

This was observed on numerous days following the installation. Example 20 wide by 50 long attic. Of vent for every 300 sq. Temp 84f at 5pm.

Building codes vary. 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. 20 x 50 1 000 sq. Help determine optimal sizing of solar attic fans.

Gable fans will be rated for a certain amount of free space ventilation. The opening of the boom mouth must be large enough for the attic fan to consume the hot air from the attic. Cfm cubic feet per minute is a measure of the amount of air the fan moves in a minute. 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.

This indicates the amount of ventilation area independent of the gable opening where the fan is installed. Always have a balanced ventilation system.