There are two basic types of attic fans.
Are attic fans necessary with central air.
Attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents.
Attic ventilation fans offer mechanical ventilation using a fan to draw in cool outside air and force out warm moist air.
Air is drawn in through the attic fan and air is expelled through the roof vent system to keep your attic cooler and drier preventing ice and moisture issues throughout the winter.
I have large attic with ridge vents and screened vents at either end of the attic to maintain air flow.
Rooftop fans and gable fans.
I am thinking that in addition to cooling the attic the attic fan.
I have a shop in my attic for some of my hobbies and it get s very hot in the summer.
But you can install attic fans which will continuously replace the stagnant air with fresh outdoor air preventing your attic from turning into an oven.
Exhausting moderate amounts of attic air as solar fans do can counteract this reducing infiltration my calculations show it to be about right for a vented attic but either do the calculations or measure the pressures.
Now if you did have central air conditioning i would tell you not to install an attic fan and here s why.
Yes an attic fan is definitely strong enough to do that because there are hundreds of holes in the structure of the house that allow it to do that.
If i have central air do i need to replace the broken attic fan.
This pressure balance improvement and the cooling provided by the air flow are most significant in the case of a leaky ceiling.
In a properly designed passive system air enters through the soffit.
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.
Can i put a small swamp cooler or ventless a c unit up there to cool it only to use while i am in my shop maybe an hour or two a couple times a week.
Cool air enters the attic through soffit vents in the eaves.
Most homes already have some passive attic venting built in.
How does an attic fan work.
Also note that when the ac is on stack effect causes a house to pull air from the attic.
A friend of mine says attic fans are helpful only when there is no a c in a home and that all it will do it cool the attic.
Intake vents located at the lowest part of the roof under the eaves allow cool.
Hello i have an attic fan that does not work anymore.
Building codes often require about 1 foot of attic ventilation for every 750 cfm airflow.
Because typically attic fans are so strong that not only do they take the hot air out of the attic but they reach down into your house and take the cool air out of the house as well.
If installed anyway they won t work properly.
Some homes cannot accommodate the amount of attic ventilation that the older traditional style whole house fans require.
Oh an attic fan will do that.
