How Much Attic Fan Do I Need

How an attic fan works.

How much attic fan do i need.

I had my attic floor sealed and a good amount of blown in insulation. According to the home ventilating institute hvi powered attic ventilators need to move a minimum of 700 cubic feet per minute cfm for 1 000 sq. Attic vent fans are commonly rated from 800 to 1 600 cfm making one fans suitable for attics of up to around 2 200 square feet. Always have a balanced ventilation system.

Powered exhaust vents feature an electric or solar powered fan to create an effect similar to that of a turbine view example on amazon. A 1500 square feet attic would cost 70 with additional humidistat costing 15. If you want your home air conditioner to cool you better then you might want one or two attic fans. You need a minimum of 1 square foot of attic air venting for each 750 cfm of air flow.

Federal housing authority recommends a minimum of at least 1 square foot of attic ventilation evenly split between intake and exhaust for every 300 square feet of attic floor space. The moving air tries to cool down all the wood attic framing as without the fan the temperature. Professional help labor of 40 then the total would be 125. It might cost you approximately 300 600 for purchase and up to 550 when you include labor.

If you need 6 000 cfm of air flow through your house divide 6 000 by 750 to get a minimum 8 square feet of. Attic fans exhaust hot air from your attic to the outside. When i last had a new roof installed a few years ago i calculated the soffit intake area i d need for the ridge vent specs. If you live in the right climate whole house fans are a great way to keep your house cool day and night and only use about 10 to 15 of the power drawn by a central air conditioner.

Ft of attic space for example 20 x 50 to be effective. Yet i still see the attic temperature reach 145 degrees. All you need to know about attic ventilation. An attic fan is installed on the slanted side of your roof or on one of the gable sides of your attic.

Attic fans are cheap compared to whole house fans. These fans are designed to remove excess heat from your attic which in theory is supposed to lessen the load on the air conditioning in your home.