They can cool your home in less than an hour.
How do you measue for a attic fan.
To determine the size of your attic multiply the width by the length of the attic floor in feet.
Next multiply the square feet of attic space by 0 7 to get the minimum number of cubic feet of air per.
Then enter the height at the highest point.
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.
I know the dimensions of my attic space.
A typical fan can t do both the work of an attic and the whole house fan but a whole house fan does both.
Then click on calculate.
Multiply the total air volume in cubic feet by 30 which represents a complete air change every 2 minutes.
Finding the right sized whole house fan for your home.
How to size a whole house attic fan.
Enter the length and width of your attic or ceiling crawl space.
You want to make the ceiling plane is as air tight as possible.
Calculate the required cfm air flow.
Measure the length of one blade from tip to base.
They can cool your home in less than an hour.
Be sure to measure from just above the blade root as shown or from where the blade meets the hub in an assembled fan.
Select if your roof is more flat of peaked.
Attic fan size calculator step 1.
Its a matter of personal preference.
Find the overall air volume of your home.
How to size attic exhaust vent fans for your home attic size.
You can check the recommended levels of insulation for your region on the energy star website here.
And then add insulation if your attic does not have the recommended levels.
You can size a whole house fan for either a moderate flow or the breeze effect.
For open blade fans see our ceiling fan calculator.
The formula above gives an approximate value of the cfm needed for an attic fan.
For heating and air conditioning airflow or for other exhaust fan situations see our airflow calculator.
Option 1 moderate flow efficient cooling 1 5 2 0 cfm of air flo.
Fans that measure 52 inches are the most commonly used.
Multiply the blade length by two and add that measurement to the hub diameter from step 3 to determine your total fan diameter.
Multiply length times.
Ceiling fans come in a variety of sizes ranging from 30 inches for small rooms to 70 inches for larger rooms.
Measure the length and width of each floor of your home with the tape measure.
Cfm cubic feet per minute is a measure of the amount of air the fan moves in a minute.
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.
