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Whole House Fan Sizing Formula

We generally utilize a formula of 2, 2.5, or 3 CFM (Cubic Feet per Minute) per square foot of living area. A decent system would be 2 CFM, a better system would be 2.5 CFM, and the greatest system would be 3 CFM. Simply use the calculator on this website to determine how much CFM you require in your home. This mathematical formula will always work for any size home, and remember that the more airflow you have, the better.

The Size Factor

There are two more variables to keep in mind when determining the size of a whole house fan.

Climate: A decent cooling system should function well in a coastal environment where the climate is cooler If you live in a desert area where the environment is hot during the day but cooler at night, the best approach would be to use a solar power system.

Ceilings: If the ceilings in your home are higher than 8 feet, you’ll want to size the system a little larger to account for the greater air volume.

whole house fan locations

Whole House Fan Sizing Formula

We utilize a standard formula of 2, 2,5, or 3 CFM per square foot of living area. 2 CFM would be sufficient for a good system, 2.5 CFM for a better system, and 3 CFM for the best system. Utilize the calculator on this page to determine the amount of CFM required for your home. This formula will always work, regardless of the size of the home, and remember that the greater the airflow, the better.

 

Considerations for Size

When sizing a whole-house fan system, there are two additional aspects to keep in mind:

In a coastal area where the environment is colder, a well-designed system should be able to function. There are a number of factors to consider when deciding on the ideal system for a desert environment where temperatures can fluctuate greatly throughout the day and night.

If the ceilings in your home are higher than 8 feet, you’ll need to size the system a little larger to account for the increased airflow.

whole house fan locations

Whole House Fan Sizing Formula

As a rule of thumb, we apply a formula that calls for either 2, 2.5, or 3 CFM, which stands for “Cubic Feet per Minute,” per square foot of living space. A system with 2 CFM would be considered good, a system with 2.5 CFM would be considered better, and a system with 3 CFM would be considered the best. Use the calculator that can be found on this page in order to determine the amount of CFM that is required in your house. This mathematical formula will work every time, for homes of any size; just keep in mind that increased airflow is always preferable.


Considerations for Sizing

When sizing a whole house fan system, two extra factors must be considered:

Location: A good system should perform well in a coastal zone where the environment is cooler. The best system would make the most sense if located in a desert region where the environment is scorching during the day but chilly at night.

Ceiling Height: If the home’s ceilings are higher than 8 feet, make sure you size the system to account for the extra air volume within.

whole house fan locations

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