I had the Fantastic Fan vent cover on my last SOB so I could leave it open in the rain, this one has the built in rain sensor so not really needed. I thought the cover over the fan would prevent dry rot, but nope the cover on the old fan still became brittle and fell apart. I had to modify it with a little trimming to clear the antenna but I got it to fit. Would it really hurt to trim it with a dremmel or something like that?