Blow Hot Air Out Of Attic

Most homes already have some passive attic venting.

Blow hot air out of attic.

Low cfm similar to a bathroom vent 300cfm and only in the hot spots basically by adding an inline ducting fan to the return ducts for the hotspot rooms. It is placed at the highest point of your roof so that the hot air rises to get out. Install electric ventilators and attic fans which remove hot air from an attic. A ventilator fan can blow conditioned air up or down depending on the position of the blower unit.

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. This type of vent runs along the entire ridge of your roof. If you have only one box fan turn the fan in or out of the window in accordance with the outside temperature. If the temperature outside is cooler than the temperature inside the room face the fan in the window so that it blows air in which can usually be done at night and in the early morning when the air outside is normally cooler.

This will keep your attic cooler which will reduce the cooling load on your home. However with that understanding that creating negative pressure in the attic can cause all kinds of problems sucking out air from the conditioned space possible back drafting of combustion appliances etc he has come up with the idea to blow air into the attic instead i e creating positive pressure to force the hot air out. Hot air exhaust vents located at the peak of the roof allow hot air to escape. Trying to solve the heat gain problem in your attic by using a fan is like lying out at the beach with a fan blowing over you and thinking you re not.

They have thermostats that turn the fan on at a recommended preset temperature of 100 110 degrees. 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. Taking advantage of this natural process referred to as passive ventilation is the most common way to vent an attic. Newer attic fans have insulated doors that close in 30 seconds when the fan s not operating.

On the theme of creating positive pressure in the attic and displacing hot attic air with cooler exterior air ventilation fans designed for foundation ventilation could possibly used in place of 22 5 inch eave vents to push in exterior air and thereby push out attic air through high gable vents and eyebrow vents. Alternatively install passive vents such as gable soffit and ridge vents which are openings in the roof that allow hot air to escape. Using a fan to blow hot air out of the attic doesn t address the radiant heat flow from the roof to the attic floor. However for best results you must have sufficient vents to allow for the free airflow.

My idea is to vent the build up of hot air that has risen to the ceiling in the hotspot rooms into the attic so that air from cooler parts of the house can move in.