How Much Attic Fan Do I Need

Ideally there should also be plenty of soffit intake space their calculations recommend 336 net square inches of open soffit ventilation to supply 700 cfm.

How much attic fan do i need.

Ft of attic space for example 20 x 50 to be effective. Professional help labor of 40 then the total would be 125. I had my attic floor sealed and a good amount of blown in insulation. How an attic fan works.

You need a minimum of 1 square foot of attic air venting for each 750 cfm of air flow. Attic x 0 7 700 cfm minimum fan rating add an additional 20 cfm x 1 20 if you have a steep roof and 15 cfm x 1 15 for a dark roof. 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. It might cost you approximately 300 600 for purchase and up to 550 when you include labor.

All of that is in place. 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. An attic fan is installed on the slanted side of your roof or on one of the gable sides of your attic.

Always have a balanced ventilation system. 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. All you need to know about attic ventilation. 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.

Attic fans exhaust hot air from your attic to the outside. 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. If you want your home air conditioner to cool you better then you might want one or two attic fans. The moving air tries to cool down all the wood attic framing as without the fan the temperature.

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. Powered exhaust vents feature an electric or solar powered fan to create an effect similar to that of a turbine view example on amazon.