Roof Exhaust Fan Working Principle

Single phase motors are field convertible from 115v to 230v.

Roof exhaust fan working principle.

Cold air is drawn in from outside through the soffit vents or roof. 3 phase motors field convert from 230v to 460v. Rolled venturi surrounds fan within the 18 gauge galvanized steel wind band. In general a large capacity fan running at low speed makes less noise than a small fan operating at high speed.

Using your duct system as a whole house fan. All whole house fans should be installed with rubber or felt gaskets to dampen noise. Attic fans are installed at the roof level of your home to regulate the heat level. 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. Rugged steel base with welded mounting plates allows easy installation. They can help you save a lot of money on your energy bills as you may not have to use air conditioning if the weather isn t too hot. 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.

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. 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. Intake vents located at the lowest part of the roof under.