How Do You Measue For A Attic Fan

Calculate the required cfm air flow.

How do you measue for a attic fan.

They can cool your home in less than an hour. Measure the length of one blade from tip to base. Multiply length times. Ceiling fans come in a variety of sizes ranging from 30 inches for small rooms to 70 inches for larger rooms.

You can also view my blog post about attic air sealing here as well as a great article from a well respected professional in the home performance industry about power attic ventilators here. The formula above gives an approximate value of the cfm needed for an attic fan. Attic fan size calculator step 1. Enter the length and width of your attic or ceiling crawl space.

Finding the right sized whole house fan for your home. Select if your roof is more flat of peaked. Be sure to measure from just above the blade root as shown or from where the blade meets the hub in an assembled fan. You want to make the ceiling plane is as air tight as possible.

More importantly though you ll need to choose the right size ceiling fan according to the size of the room. One of the most asked questions we get is what size whole house fan do i need. Cfm cubic feet per minute is a measure of the amount of air the fan moves in a minute. Measure the length and width of each floor of your home with the tape measure.

For heating and air conditioning airflow or for other exhaust fan situations see our airflow calculator. Find the overall air volume of your home. How to size attic exhaust vent fans for your home attic size. 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.

Option 1 moderate flow efficient cooling 1 5 2 0 cfm of air flo. They can cool your home in less than an hour. A typical fan can t do both the work of an attic and the whole house fan but a whole house fan does both. Attic fan size calculation.

To determine the size of your attic multiply the width by the length of the attic floor in feet. And then add insulation if your attic does not have the recommended levels. Then click on calculate. Multiply the blade length by two and add that measurement to the hub diameter from step 3 to determine your total fan diameter.

Multiply the total air volume in cubic feet by 30 which represents a complete air change every 2 minutes. Then enter the height at the highest point. Fans that measure 52 inches are the most commonly used. You can check the recommended levels of insulation for your region on the energy star website here.

How to size a whole house attic fan. Its a matter of personal preference. I know the dimensions of my attic space.