How Many Fans Do I Need?
| One Story Homes | Multi Level Homes |
| 1000 Sq. ft = 2 fan system | 1000 Sq. ft = 1-2 fan system |
| 1500 Sq. ft = 3 fan system | 1500 Sq. ft = 2 fan system |
| 2000 Sq. ft = 3-4 fan system | 2000 Sq. ft = 2-3 fan system |
| 2500 Sq. ft = 3-5 fan system | 2500 Sq. ft = 3-4 fan system |
| 3000 Sq. ft = 4+ fan system | 3000 Sq. ft = 4 fan system |
These are estimates. Please take into consideration the location and layout of your home along with your lifestyle.
Rules of thumb to determine the number of whole house fans in CFMs (Cubic Feet per Minute)
1 Level Home: Take the total of square feet of living space and multiply it by 2.5. For example, a 1000 square foot house would require fans of approximately 2500 CFM (1000 x 2.5) or about two fans.
Multi-Level Home: Take the total number of square feet of living space and multiply it by 2. For example, a 1500 square foot house would require a fan of approximately 3000 CFM (1500 x 2).
Rule of thumb to determine how much attic ventilation is needed
To calculate the attic ventilation needed for your home, you may divide the your fan CFM by 750. If you have, say, 3,000 CFM fans, you will need approximately 3,000/750 = 4 square feet of attic ventilation area (soffit, gable, roof, ridge vents).
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Layout of Home – Strategically place the fans in the rooms that are used the most and where you sleep. You must have attic access to install each fan. |  |
Lifestyle – Do you have children? Is your entire home occupied most of the time? You can eliminate some square footage if you close doors of the unoccupied areas of the home. |
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Location – Is your home in the desert or inland area or in a cooler climate perhaps closer to the water? – The warmer climates will require more air moment therefore more fans. |  |
Levels – Levels of your home – Single or Multi Level – See Diagram Above |
For large homes and custom homes, please call us at 866-230-7474 so that we can help you determine the number of fans that would be necessary for your home.
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