Roof Exhaust Fan Working Principle

Rugged steel base with welded mounting plates allows easy installation.

Roof exhaust fan working principle.

Rolled venturi surrounds fan within the 18 gauge galvanized steel wind band. 3 phase motors field convert from 230v to 460v. You can set a multi speed fan to a lower speed when noise is a problem. These roof ventilation fans are weatherproof to ensure long life for outdoor safekeeping.

Single phase motors are field convertible from 115v to 230v. Theory behind attic fans is they work on the principle of drawing hot air out of the attic and pushing it outside through the gable or roof levels. Once inside the air heats up and rises higher ultimately exiting through venting at the roof s gables through ridge vents cut into the roof s apex or other vent holes in the roof. Using your duct system as a whole house fan.

Intake vents located at the lowest part of the roof under. In general a large capacity fan running at low speed makes less noise than a small fan operating at high speed. Attic fans are installed at the roof level of your home to regulate the heat level. As hot air rises to the top fans push the hot air out and cool down the home by drawing in the fresh air.

All whole house fans should be installed with rubber or felt gaskets to dampen noise. As the air leaves it creates negative pressure behind it sucking in cool air from below into the soffits and creating a self repeating ventilation process. In simple terms it replaces the hot air in the attic with fresh air from outside.