Attic Fan Size

This will help to avoid premature damage to the shingles or mold building up in moist hot.

Attic fan size.

Minimum opening size the 2012 international residential code requires an attic access opening for attics with an area greater than 30 square feet and a vertical height in excess of 30 inches. To determine the size of your attic multiply the width by the length of the attic floor in feet. It helps to cool your home temperatures and the attic by approximately 30 degrees. 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.

The warm air escapes through the attic and to the attic vents allowing the circulation of chilly air from the windows. For a single story house this is usually the same as the square footage of the house itself plus any attached garage area. Master flow 1450 cfm silver electric powered gable mount electric attic fan model egv5smt view the master flow gable vents 118 00 118 00. This attic ventilation calculator computes the size and number of solar powered attic fans to achieve the proper ventilation for your attic.

An attic fan works by exchanging the hot air in your attic space for fresh air pulled through the vents. Attic fan size calculator. Cfm cubic feet per minute is a measure of the amount of air the fan moves in a minute. Whole house fans work on the principle of removing the hot and humid air out of the house.

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. 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. An attic fan is an electric exhaust fan that mounts in your home s attic. The formula above gives an approximate.

20 x 50 1 000 sq. Example 20 wide by 50 long attic. The whole house fan is installed inside the attic between the living space and ceiling.