Insulated Fan Cover, 17-3/4 In O D

Insulated Fan Cover, Depth (In.) 3, Outside Dia. (In.) 17-3/4, Polyethylene Construction Material, Includes Magnets, Drawstring and Hook and Loop Closure, Stops Unwanted Infiltration Weather, For Use With 12 Inch Shutter Mount and Guard Mount Exhaust Fans 1HLA2, 1HKL4