Sizing Attic Ventilation Fans

Attic fans perform this ventilation by pushing hot air out into the environment while also pulling fresh cool air into the attic.

Sizing attic ventilation fans.

So here the cfm of the fan cfm x 1 15. See the benefits of attic ventilation a new roof is more than just shingles. They can quickly remove a larger volume of hot and or humid air from your attic compared to static ventilation which helps save money on your heating and cooling. Example 20 wide by 50 long attic.

Our installer friendly energy star ventilation solutions help you design beyond code without compromising interior aesthetics. A whole house fan sucks warm house. Attic fan size chart for quick reference. If your attic requires a 1500 cfm fan then it should also have a 1500 300 5 sq ft air vent.

Proper attic ventilation consists of a balance between air intake at your eaves soffits or fascias and air exhaust at or near your roof ridge. This attic ventilation calculator computes the size and number of solar powered attic fans to achieve the proper ventilation for your attic. Next multiply the square feet of attic space by 0 7 to get the minimum number of cubic feet of air per minute that the fan should be rated to move. 20 x 50 1 000 sq.

For the exhaust to work properly the attic should have enough intake air vents. A whole house attic fan is installed in the ceiling between the top floor and the attic as a supplement to air conditioning. Effective attic ventilation systems reduce damaging heat and moisture in your attic promote energy efficiency by helping to reduce the load on your air conditioner in the summer and also reduce the risk of ice dam formation on your roof. Well managed indoor air quality is crucial to code compliance.

Minimum intake air vent size cfm 300 sq ft. The result is a cooler attic space with plenty of air exchange. Master flow egv5 gable mount attic ventilators are master flow egv5 gable mount attic ventilators are a great choice for exhaust ventilation. Intake air vent size.