Insulated Fan Cover, 31-1/2 In O D

Insulated Fan Cover, Depth (In.) 4-1/4, Outside Dia. (In.) 31, Polyethylene Construction Material, Includes Magnets, Drawstring and Hook and Loop Closure, Stops Unwanted Infiltration Weather, For Use With 24 Inch Shutter Mount and Guard Mount Exhaust Fans 1HLB1, 1HLB2, 1HLB3, 1HLB4, 1HKL8