Do I Need An Attic Exhaust Fan

Intake vents located at the lowest part of the roof under the eaves allow cool.

Do i need an attic exhaust fan.

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. Fresh air is pulled in from your soffits and or roof vent creating a draft through your attic. 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. Whole house fans need windows and doors open and attic fans need lots of soffit vents to suck.

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. That said air resistance and interference such as vent grates reduces the area of true ventilation. Attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents. A powered attic ventilator has a different purpose.

Ok i would definitely not recommend an attic fan. Ideally this will lower the high temperatures that have built up in your attic. It doesn t matter if the ventilation openings are spread out as long as there is sufficient space for all the air to escape. Note that these two feet would not need to be one large opening.

So if your fan is rated at 1500 cfm you will need about two feet of totally open space 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. 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. That means two feet of open space.

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. It is designed to lower the temperature of an attic by exhausting air from the attic and replacing attic air with outdoor air. This air is then exhausted through the fan to the outside. A fan might be necessary if the construction of your house is such that you.