Brings fresh air into the room while expelling hot air.
Typical size is 20”.
Larger window fans require mounting kits and side panels. The panels support the fan and prevent air from circulating around and back into the fan, resulting in a loss of performance.
Smaller units are easiest to install, as they come with the panels attached to the fan.
Used to intake and exhaust, for bringing inside air into a room or expelling inside air out of a room. Better models have electrical reversibility, which allows the user to switch from exhaust to intake without turning the fan around.