Box fans are used to draw out hot air from the house and take in cool air.
Window fans can work two ways. Fans can work either as an exhaust to draw the air out of the room or to bring fresh air into the room. There are different types of window fans to choose from, but they differ in how they are set up to draw air out or into the room.
Different Fans
Some fans have switches that make the fan run on "exhaust" or "intake" without having to physically turn the fan around. Some fans must be placed in the window with the correct side facing out or in, depending on which function you want the fan to perform. Box fans usually need to be physically turned around, while other compact window fans have switches to change the air-flow direction. There are dual fans and single fans, such as a box fan.
Exhaust
If you have a fan that has switches for intake and exhaust, you can move the switch to "exhaust," which means the air from the room is drawn to the outside. This function is used to draw out the hot air from the room. On a box window fan, the fan is turned around so that when you are looking at the blades turning, they are spinning counterclockwise.
Intake
On a box fan, the fan is turned around to bring in fresh air. If you are looking at the fan, the blades will be turning clockwise. On a fan with a switch, the switch is moved to "intake," which means the air from the outside is drawn into the room. This function is used to bring in fresh air or cool air from the outside.
Using Two Fans
If you have a hot house and the weather outside is cool, you can use a window fan in one window set on "exhaust" to draw out the hot air. In another window, you can have the window fan running on "intake" to bring in the cool air from the outside to cool the room down. Fans that are used to bring in the cool air should be installed on a shady side of the house.
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