Attic Fan Blade Orientation

This is the best ceiling fan direction for air conditioning since it makes the air feel cooler than it is.

Attic fan blade orientation.

Whole house fans are used to blow hot air out of the attic by sucking cool air through the house up though the whole house fan and out though the gable vents in the attic. Likewise if the blade is angled down and the fan turns the opposite direction the reverse is true. The leading edge of the blade will be covered with dirt. Air will blow in the other direction towards the back.

If a blade is angled down and the fan turns in the same direction as the blade angle it will blow forward. Some whole house fans however can be reversed to spin in the opposite direction. Fan blade rotation is determined to be either clockwise or counterclockwise when viewed from the air discharged side. A ceiling fan should rotate counterclockwise in the summer so the blades push cooler air down in a column.

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.