Sizing Attic Ventalation Fans And Intake Louvers

In general there are five types or categories of exhaust vents.

Sizing attic ventalation fans and intake louvers. Exhaust fans force out stale indoor air so it can be replaced by fresh outdoor air. For balanced ventilation an equal amount of intake vent area net free area should also be installed. Ridge vents power fans traditional electric and solar powered wind turbines gable louvers and roof louvers. Attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents.

Fan related products 19 25 in. Square white aluminum automatic shutter gable louver vent. Shed vent door vent built in screen gable vents louvers white gable vents louvers 12x16 return air grille 24 in. They re commonly used to reduce moisture and remove smoke and odors in restaurants residences shop and production floors and commercial buildings.

It s also important to have plenty of soffit or gable vents for the fan to draw air into the attic. Iliving 16 wall mounted exhaust fan automatic shutter variable speed vent fan for home attic shed or garage ventilation 1200 cfm 1800 sqf coverage area 4 6 out of 5 stars 487 109 77 109. Intake vents located at the lowest part of the roof under the eaves allow cool. 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.

Exhaust fans mount through a cutout in a roof or wall. Proper attic ventilation consists of a balance between air intake at your eaves soffits or fascias and air exhaust at or near your roof ridge. The ravc recommends never mixing two types of exhaust vents on the same roof above a common attic because it could short circuit the attic ventilation system.