Attic Fan Blade Orientation
If a blade is angled down and the fan turns in the same direction as the blade angle it will blow forward.
Attic fan blade orientation. It allows you to turn your thermostat up a few degrees. Likewise if the blade is angled down and the fan turns the opposite direction the reverse is true. A ceiling fan should rotate counterclockwise in the summer so the blades push cooler air down in a column. Fan blade rotation is determined to be either clockwise or counterclockwise when viewed from the air discharged side.
Some whole house fans however can be reversed to spin in the opposite direction. Air will blow in the other direction towards the back. The motor s nameplate depending on manufacturer may contain information on direction of blade rotation. These fans are usually wired to run in one direction.
One static vent style is the turbine vent which uses wind to power its enclosed fan all it takes is a light breeze to rotate the blades and suck heat out of the attic view example on the home.