Quote Originally Posted by Abrasive View Post
How do you keep the fan from sucking it in? I picture it getting sucked down and blocking off the opening altogether or coming loose and getting sucked into the fan. Just curious.
there are 2 pieces of plastic that the original flap is tucked into, i tucked it in with the old one, and a smear of caulk. has held like champ so far.

the way to do this and really make it last is to get some rubber, like a old car tube rubber, and some rubber cement, glue up the old flap, and the new rubber, let them dry, them press the new rubber over the old flap. also tuck the rubber into the grove.

rubber roofing would work to, EPDM its called,(it feels like a inner tube) sometimes scraps are left on roofs that are large enough to do this repair. or ask a roofer for a scrap piece.