Do I Need An Attic Exhaust Fan

A fan might be necessary if the construction of your house is such that you.

Do i need an attic exhaust fan.

Attic ventilation fans help cool air your attic by pushing out the stifling hot air from inside the attic and bringing in cool air from outside. Attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents. Unlike a ventilation fan a whole house fan an attic mounted fan that exhausts air from a home at night is designed to cool a house that is to lower the indoor temperature. It doesn t matter if the ventilation openings are spread out as long as there is sufficient space for all the air to escape.

Attic fans exhaust hot air from your attic to the outside. Ok i would definitely not recommend an attic fan. It is designed to lower the temperature of an attic by exhausting air from the attic and replacing attic air with outdoor air. Ideally this will lower the high temperatures that have built up in your attic.

As long as you have enough space at the base of the roof for an equal amount of soffit vents you shouldn t need a fan. Fresh air is pulled in from your soffits and or roof vent creating a draft through your attic. That said air resistance and interference such as vent grates reduces the area of true ventilation. Note that these two feet would not need to be one large opening.

Because what happens is attic fans are so strong that they actually reach down into the conditioned space of your house and they do that by using the wall cavities and where the outlets and pipes come through the walls as places where they draw air from the inside of your house it s that air conditioned air and it ll pull it right up into the attic and exhaust it outside. Generally speaking you need a ratio of 1 300 where for every 300 square feet of ceiling space you need 1 square foot of attic ventilation. This air is then exhausted through the fan to the outside. Whole house fans need windows and doors open and attic fans need lots of soffit vents to suck.

A powered attic ventilator has a different purpose. So if your fan is rated at 1500 cfm you will need about two feet of totally open space in your attic. This prevents hot air from seeping into your home and driving up the temperature in the living space which reduces the load on your air conditioner. Intake vents located at the lowest part of the roof under the eaves allow cool.