Necessary Cfm For Attic Fan

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.

Necessary cfm for attic fan.

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. To calculate the amount of attic exhaust area you will need divide the fan s capacity in cfm by 750. 17600 cubic feet 1600 11. For spaces up to 4 800 square feet we recommend the quietcool smart 2830 cfm power gable mount attic fan view on amazon as it s easy to install simple to use and extremely energy efficient.

Our stylish powder coated steel 30 watt fan will effectively ventilate up to 2500 sq. There is a dead spot in the corner of a closet where i could create a 100 square inch chase connecting the subarea with the attic and install a 500 800 cfm in line fan. The natural light solar attic fan fan installs on a shingle roof and is capable of moving over 1 600 cfm of air impressive for a solar panel powered fan. Ft of attic space for example 20 x 50 to be effective.

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. This is the least expensive high quality fan feature for feature available. Divide the cubic feet measurement by the cfm rating assigned to the fan. And i agree with the additional energy costs but my attic fan is a 1500 cfm 40 watts.

How an attic fan works. 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. Attic fans exhaust hot air from your attic to the outside. I understand a blower door test would show the air leaks and i ve seen this 2x but i m trying to understand with an attic fan on in an unsealed attic the attic fan should pull the air in the home up into the attic.

Since the discussion here recommends against an attic venting fan i have another idea for consideration. For proper cooling and efficient operation any whole house comfort ventilator requires adequate unobstructed outlets in the attic through soffit vents grilles or louvers. Of attic space at up to 1550 cfm. An attic fan is installed on the slanted side of your roof or on one of the gable sides of your attic.

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.