Attic Fan Insulation Cover, 38 x 46 Inch, 0.2 Inch Thick — Open-Box, 15% Off

38 x 46 Inch Flexible Cover: 0.2 in thick removable foil-and-foam sheet for compatible whole-house fan and ceiling shutter openings

Adhesive Hook-and-Loop Mount: Included hook-and-loop tape attaches the cover around the opening; apply to a clean, dry mounting surface and press around the perimeter

Reflective Foil and Closed-Cell Foam: Aluminum foil and closed-cell foam form a flexible cover layer for an unused fan or ceiling shutter opening

Measure Before Ordering: Check that the 38 x 46 in sheet is large enough to span the full opening and reach the intended mounting area on all four sides; trim excess with scissors if needed

Removable for Fan Use: Cover the opening while the whole-house fan is not operating; detach before using the fan and reinstall when the fan is no longer in use

Cover an unused whole-house fan opening with a flexible 38 x 46 in foil-and-foam sheet. The cover is 0.2 in thick and can be trimmed with scissors when needed. Before ordering, measure the full area the cover must span — not only the visible shutter opening. Check that the 38 x 46 in sheet can reach the intended mounting perimeter on all four sides. The included adhesive hook-and-loop tape is used to mount the removable cover around the fan opening. Apply the tape to a clean, dry mounting surface and press around the perimeter. The cover is flexible, not a rigid panel. Remove it before operating the whole-house fan, then reinstall it when the fan is no longer in use. What size is the cover? The sheet measures 38 x 46 inches. How thick is the material? The flexible foil-and-foam sheet is 0.2 inches thick. What should I measure before ordering? Measure the full area the cover must span and check that the 38 x 46 inch sheet can reach the intended mounting perimeter on all four sides. Is this a rigid panel? No. It is a flexible foil-and-foam sheet that can be trimmed if needed. Does the adhesive mounting tape come with the cover? Yes. Adhesive hook-and-loop tape is included. Can I cut the cover to size? Yes. The flexible sheet can be trimmed with scissors if needed. Where does the cover mount? It mounts around the fan opening on the room side using the included adhesive hook-and-loop tape. Can I run the fan with the cover installed? No. Remove the cover before operating the whole-house fan.