Blow Hot Air Out Of Attic

Hot air exhaust vents located at the peak of the roof allow hot air to escape.

Blow hot air out of attic.

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. 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. Newer attic fans have insulated doors that close in 30 seconds when the fan s not operating. 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.

Most homes already have some passive attic venting. Install electric ventilators and attic fans which remove hot air from an attic. There are also room to room ventilator fans to move the conditioned air. This will keep your attic cooler which will reduce the cooling load on your home.

Alternatively install passive vents such as gable soffit and ridge vents which are openings in the roof that allow hot air to escape. However for best results you must have sufficient vents to allow for the free airflow. 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. They have thermostats that turn the fan on at a recommended preset temperature of 100 110 degrees.

This sends hot air up and out cooling your house and your attic. This type of vent runs along the entire ridge of your roof. Much of that heat then conducts downward and finds its way into the house. 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.

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. A ventilator fan can blow conditioned air up or down depending on the position of the blower unit. 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. If you have only one box fan turn the fan in or out of the window in accordance with the outside temperature.

Taking advantage of this natural process referred to as passive ventilation is the most common way to vent an attic.