Attic Fan Cfm Rating

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. 17600 cubic feet 1600 11 what this means is that every eleven minutes the air in the home is being exchanged by a fan of this rating along with having windows open in each room. An attic fan used for venting pushes the hot air out the roof space so if it isn t replaced from outdoors you get depressurization.

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You d need an attic fan rated at approximately 720 cfm.

Attic fan cfm rating.

As the attic cools the smart fan will automatically cycle down to lower speeds the lowest being 1 000 cfm which only uses 15 watts of energy resulting in a cheaper air conditioning bill and cooler home temperature temperatures can drop as much as 50 degrees these two factors make it an excellent energy and cost saver. I read that venting is important. To facilitate faster air exchange would necessitate choosing a fan with a higher cfm. Vent fan location locate roof mounted fans on the back of the roof below the ridge but not so high as to be visible from the front of the house in the middle of the main part of the attic.

Divide the cubic feet measurement by the cfm rating assigned to the fan. If you have 1 200 cubic feet of attic the calculation is 1 200 x 0 6 720.

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