Valterra' FridgeCool Exhaust Fan keeps refrigerator coils cool and working efficiently with a wind tunnel design. It is fully automatic with no need for switches, activating when the fridge is on and the temperature is hot. The fan installs at the top of the roof vent or under the fridge coils for best cooling. 12.5 CFM / 49.8 MA. 2-3/4" x 3-1/2".