Do Attic Fans Push Air In Or Out

Cool air enters the attic through soffit vents in the eaves.

Do attic fans push air in or out.

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. If you set one to push air in you ll be pushing all kinds of dust dirt and insects into the. The pressurized air in the attic will force its way through ceiling cracks into the conditioned house. It allows hot air to escape in the summer and can also help reduce the chances of ice damage in the winter by allowing a natural flow of outdoor air to ventilate the attic.

How does an attic fan work. The attic fan was pulling air from the house into the ducts then out of the ducts in to the attic through leaks in the ducts. That same week in the same area i saw an attic fan someone had just purchased right next to a dehumidifier also new in the box. Insulated attic fan door newer attic fans have insulated doors that close in 30 seconds when the fan s not operating.

The fan blades will draw out the warmer air that is rising to the upper level from the lower level moving it outside. The cooling principle here is simple. Most homes already have some passive attic venting built in. If you replace the extreme hot air inside an attic that might be 140 160f with air that is 85 95f the inside of your home should also be cooler.

When you install a fan to pressurize the attic the attic will become pressurized with respect to the outdoors and with respect to the conditioned house below. 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. Place one or two fans in upstairs windows with the fans facing out. The air source will come from the eaves of the roof.

No these fans are not supposed to move air through your home. Place one or two fans on the lower level in the window facing in so that fresh air is simultaneously drawn into the house. It draws cooler outside air in through open doors and windows to create a pleasant breeze that pushes hot air out through attic vents. They only move air through an attic space above where you are.

Set them both to draw air out.