How To Size An Attic Fan

Some professionals multiply the square feet value with 0 6 instead of 0 7.

How to size an attic fan.

Then click on calculate. Cfm cubic feet per minute is a measure of the amount of air the fan moves in a minute. How to size attic exhaust vent fans for your home attic size. Multiply length times.

Without an attic fan the temperature in your attic can climb to a searing 150 degrees. By dispelling hot air from your attic an attic fan can reduce the temperatures of your upper level rooms by 10 degrees extend the life of your roof shingles and cut air conditioning expenses by up to 30 percent. Calculate the required cfm air flow. The formula above gives an approximate value of the cfm needed for an attic fan.

Next multiply the square feet of attic space by 0 7 to get the minimum number of cubic feet of air per. Always have a balanced ventilation system. 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. Attic fan size calculator step 1.

The warm air escapes through the attic and to the attic vents allowing the circulation of chilly air from the windows. Measure the length and width of each floor of your home with the tape measure. Simultaneously cool fresh air will be pulled through the open windows and circulated through every room effectively replacing all of the air in your home and minimizing your dependence on air conditioning. Select if your roof is more flat of peaked.

To determine the size of your attic multiply the width by the length of the attic floor in feet. Find the overall air volume of your home. By sizing and implementing a whole house fan you can pull the warm stale air from your entire home into the attic where it s vented outside. This is a quick rundown of the different types of attic fans their most common features and.

I know the dimensions of my attic space. The whole house fan is installed inside the attic between the living space and ceiling. Whole house fans work on the principle of removing the hot and humid air out of the house. It helps to cool your home temperatures and the attic by approximately 30 degrees.

How to size a whole house attic fan. Multiply the total air volume in cubic feet by 30 which represents a complete air change every 2 minutes.