Broan 353 Gable Mounted Attic Fan
This Broan 353 Gable Mounted Attic Fan remove super-heated attic air, making any home more comfortable, whether it's air conditioned or not. The Broan 353 Gable Mounted Attic Fan helps those homes attics stay cooler during the day and helps the air conditioners run less and doesn't have to work nearly as hard. Any and all Broan Powered Attic Ventilators are as efficient as they are dependable and come with automatic thermostats from 70-120 degree's. This Broan Gable Mounted Attic Fan can be installed behind and existing dormer or cut in a 15 round . You can purchase automatic shutter 433 sold separately. Make sure to have sufficient whole on the opposite side of the attic to exhaust the hot air out using your Broan 353 Gable Mounted Attic Fan.
. Quiet, high-performance operation for inside-the-attic applications.
. Galvanized steel housing, ribbed for added strength.
. Mounting brackets simplify installation.
. 1140 CFM for attics up to 1630 sq. ft.
How to calculate the cfm needed for your attic application
One square foot of unobstructed inlet area is required for every 300 cfm output.
Multiply your attic square footage by .7 for minimum air delivery need to exhaust the attic. For darker roofs add 15% to the cfm you just calculated. For exceptionally large attics use 2 fans and have sufficient exhaust or it will put the heat back down into the house.