Covering A Hole In My Main Duct

[crokett]

As part of the bathroom remodel I removed one of the branch ducts from the main duct in my house. I left the damper there but it still leaked air. I bought a 6" cap intending to replace the damper but the hole in the duct isn't perfectly round and I couldn't get the cap in. I covered the hole with foil tape until I can cut the hole round to install the cap but, is the tape a good enough repair? There is no air leaking and I can't see the cap having any more insulating properties than the tape does.

[chopnhack]

You can temporarily throw some insulation around it if your concerned with air infiltration.

[DaveS]

I had a "finished garage" in my last house that I turned back into a garage.

The previous owners had punched a 12" hole in the main trunk coming off the air handler in the garage.

I used a piece of sheet metal and some brush on duct sealant.

I believe the tape will eventually fail, but probably not while you are in the house.

[Hellrazor]

The tape will fail. Get a piece of metal, apply sealent and screw it fast with self tap screws.

[crokett]

Thanks Mike, that is what I figured. I will return the caps I bought and get the sheet metal and some sealant.