Attic Fan Air Flow Direction

Some whole house fans however can be reversed to spin in the opposite direction.

Attic fan air flow direction.

Ceiling fan direction in the winter should be clockwise and the fan should run at the lowest speed. Powered attic ventilator fansdesigned to cool your attic by drawing the hot and humid air out of the attic and bring in a flow of chilly air from outside. You place the fans on the gable walls of your attic. Attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents.

A clockwise ceiling fan direction for high ceilings is especially important in winter. This position is also known as the reverse direction because warm air rises the air near the ceiling can be three to four degrees warmer than air near the floor. Intake vents located at the lowest part of the roof under the eaves allow cool. A ceiling fan that spins clockwise will draw cooler air up and force warmer air near the ceiling down and out toward walls.

That pulls cold air up to the ceiling and more evenly distributes the warmth the. A fan set to move clockwise opposite the ceiling fan direction in summer and run on low speed creates an updraft. These fans are usually wired to run in one direction. However if your attic has blocked soffit vents and is not well sealed from the rest of the house attic fans will suck cool conditioned air up out of the house and into the attic.

This pulls cool air up toward the ceiling which in turn displaces the warm air that rises and collects near the ceiling. After entering the soffit air needs to flow upward and exit through gable vents or ridge vents cooling the roof structure and roof covering to outdoor temperature.