This roof vent cover for Fantastic Fan or similar easily snaps into place with powerful magnets. You can even unfold it partway. It is 16.5″ x 16.5″ and will fit any fan with those dimensions.
This fan cover is made with premium thickness Low-E insulation, durable ripstop nylon and powerful N52 neodymium magnets.
How is it installed?
To install, remove the plastic flange around your fan. Place the flange on the window cover. Place the 8 extra magnets shipped with your cover onto the plastic flange so that they line up with the magnets sewn into the cover. Tape down the magnets on the flange and re-install. Done!