How Do You Measue For A Attic Fan

A typical fan can t do both the work of an attic and the whole house fan but a whole house fan does both.

How do you measue for a attic fan.

Ceiling fans come in a variety of sizes ranging from 30 inches for small rooms to 70 inches for larger rooms. I know the dimensions of my attic space. Find the overall air volume of your home. Be sure to measure from just above the blade root as shown or from where the blade meets the hub in an assembled fan.

One of the most asked questions we get is what size whole house fan do i need. Select if your roof is more flat of peaked. Finding the right sized whole house fan for your home. Multiply the blade length by two and add that measurement to the hub diameter from step 3 to determine your total fan diameter.

Attic fan size calculation. How to size a whole house attic fan. 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. Multiply length times.

Measure the length and width of each floor of your home with the tape measure. 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. Then click on calculate.

Next multiply the square feet of attic space by 0 7 to get the minimum number of cubic feet of air per. They can cool your home in less than an hour. Cfm cubic feet per minute is a measure of the amount of air the fan moves in a minute. You want to make the ceiling plane is as air tight as possible.

For heating and air conditioning airflow or for other exhaust fan situations see our airflow calculator. Calculate the required cfm air flow. For open blade fans see our ceiling fan calculator. Its a matter of personal preference.

They can cool your home in less than an hour. Multiply the total air volume in cubic feet by 30 which represents a complete air change every 2 minutes. Enter the length and width of your attic or ceiling crawl space. Option 1 moderate flow efficient cooling 1 5 2 0 cfm of air flo.

Attic fan size calculator step 1. You can check the recommended levels of insulation for your region on the energy star website here. More importantly though you ll need to choose the right size ceiling fan according to the size of the room. To determine the size of your attic multiply the width by the length of the attic floor in feet.

How to size attic exhaust vent fans for your home attic size. And then add insulation if your attic does not have the recommended levels. Measure the length of one blade from tip to base.