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**beenthere** · 10-24-2009, 06:08 PM

Quote:

Originally Posted by Dutch2

I'm not too sure about americanhvacparts.com and it's the only place where I can find the 12"x12" box with the 8" collar attached.

How about using a self-adhesive collar with a regular 12"x12" ceiling box?

D2.

You can use that box. but you have to bend flanges on it to seal to the ceiling. Or box it out.
And the self adhesive collar MUST be screwed fast. Or some where down the road it will come off, and suck in attic air.

dash · 10-25-2009, 12:22 AM

Quote:

Originally Posted by beenthere

You can use that box. but you have to bend flanges on it to seal to the ceiling. Or box it out.
And the self adhesive collar MUST be screwed fast. Or some where down the road it will come off, and suck in attic air.

Not the case at all,some self adhesive collars willn last the life time of the duct system.
!

But,screws wouldn't hurt.

**beenthere** · 10-25-2009, 03:27 AM

Quote:

Originally Posted by dash

Not the case at all,some self adhesive collars willn last the life time of the duct system.
!

But,screws wouldn't hurt.

Haven't had a trunk system come to the end of its life that had self sealing collars.
So I'll take your word on that.

But, I put screws in all of them.

Dutch2 · 10-25-2009, 02:32 PM

Do I use mastic to seal the ceiling box to the return grille?

**beenthere** · 10-25-2009, 03:00 PM

You can use mastic, or regular caulk. I use caulk.

Dutch2 · 10-25-2009, 03:07 PM

Caulk sounds easier

One thing I'm worried about is how to insulate the return grille boxes.

I understand that I have to do this because moisture will condense on the cold box in the summer and cause ceiling issues. What is the best way to do this?

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Adding return vents to bedrooms

Adding return vents to bedrooms

Adding return vents to bedrooms

Adding return vents to bedrooms

Adding return vents to bedrooms

Adding return vents to bedrooms