Attic Gable Fan Sizing

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

Attic gable fan sizing.

Temp 84f at 5pm. 20 x 50 1 000 sq. 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. Help determine optimal sizing of solar attic fans.

The formula above gives an approximate value of the cfm needed for an attic fan. This attic ventilation calculator computes the size and number of solar powered attic fans to achieve the proper ventilation for your attic. The attic fan kept my house cooler by 8f compared to pre fan installation days. How to size solar attic exhaust vent fans so we developed our solar powered attic fan sizer calculator.

Of vent for every 300 sq. Building codes vary. For a single story house this is usually the same as the square footage of the house itself plus any attached garage area. Temp 92 f at 5pm.

After attic fan installation ac still off during day. This indicates the amount of ventilation area independent of the gable opening where the fan is installed. This was observed on numerous days following the installation. Always have a balanced ventilation system.

Example 20 wide by 50 long attic. 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. 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. During workdays would leave air conditioner off when leaving in the morning.

The opening of the boom mouth must be large enough for the attic fan to consume the hot air from the attic. In order to facilitate this exchange of warm and cool air the general rule of thumb suggests installing at least 1 sq.