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Old 10-26-2011, 08:06 PM   #1
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Metal floor vent out of shape


The picture illustrates a metal floor vent with many leaks around the edges related to a forced air oil heating system. Lot's of cold air leaks through the perimeter of the vent because the metal is not flush against the wood border.

What would you recommend to seal in the gaps? Is there a way to get the metal back to being flush against the wood border? I tried tapping it with a piece of wood and hammer but the metal was not holding to place.

Or should I foam it or use some sort of heat tape? I'm guessing the heat tape won't stay stuck to the wood. I want to be sure whatever I use will not catch fire from the heat and the register has to also fit back into the hole so the metal should not stick out further or the register won't be able to slide in.

Thanks for your help!




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Old 10-26-2011, 08:11 PM   #2
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Metal floor vent out of shape


can you access this duct from bottom ..it should be replaced....

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Old 10-26-2011, 08:26 PM   #3
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can you access this duct from bottom ..it should be replaced....
I can't access it since its between the floor 1 and floor 2 cavity.
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Old 10-26-2011, 08:56 PM   #4
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Metal floor vent out of shape


Angle head for a drill driver, and put in some screws to hold it.
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Old 10-27-2011, 05:04 AM   #5
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Metal floor vent out of shape


Caulk the openings shut.
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Old 10-27-2011, 07:31 AM   #6
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Metal floor vent out of shape


can of spray insulation foam and with extender tube on the can start as deep as you can go 360 degrees around the entire duct let it set up then around again...and again till it is flush right to the top/edge of the duct feed the foam in easy cause it expands and might ace the register going back in.or take scrap insulation and push it down all around the duct till you can't feed anymore in....and it won't catch fire air off the furnace tops 170F hitting the register or as this video shows..brush on sealer... http://www.youtube.com/watch?v=x5SZv...812116A72B897E

Last edited by biggles; 10-27-2011 at 07:37 AM.
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Old 10-28-2011, 02:52 PM   #7
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Metal floor vent out of shape


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can of spray insulation foam and with extender tube on the can start as deep as you can go 360 degrees around the entire duct let it set up then around again...and again till it is flush right to the top/edge of the duct feed the foam in easy cause it expands and might ace the register going back in.or take scrap insulation and push it down all around the duct till you can't feed anymore in....and it won't catch fire air off the furnace tops 170F hitting the register or as this video shows..brush on sealer... http://www.youtube.com/watch?v=x5SZv...812116A72B897E
Thank you so much Biggles. I was planning to go with the GREAT STUFF foam fireblock version. You have provided some very helpful information along with the youtube vid I could not find when I looked. Thanks!!
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Old 10-28-2011, 03:22 PM   #8
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Metal floor vent out of shape


any duct that is exposed might want to brush that stuff around the connections the tighter the air delivery the better the heating..good luck
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Old 10-28-2011, 03:46 PM   #9
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Metal floor vent out of shape


I would also reshape the opening - use a hammer and a scrap piece of wood to tap it back into shape - looks like it's so out of whack it might interfere with the register's proper fit.

But be careful - the metal's sharp enough to cut
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Old 10-28-2011, 08:40 PM   #10
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Metal floor vent out of shape


To me it looks like a center take off which in my area of work is called a horn boot.If that is what it is then I would take a sturdy piece of metal rod like a HD coat hanger.I would strighten that out anf then bend a 90 degree bend in it with a 2 inch length on the short end.I would drill a small hole in the bottom of the boot and stick that 2 inch side into that hole with the long end coming stright up.Then I would take out those nails, strighten out the sides then use the hanger to pull up the boot until the edges come up past the wood floor.Then you make sure there is a slit in each corner of the metal boot and then bend a half inch flange all around the metal coming out from the floor.You can then remove that hanger and push the metal down and the half inch edge will keep it from falling through the hole.You can then use the cauclk of your choice under the flange all around.
The register should then fit down into the boot and cover up the flange.
The spray foam you want to use is very messy ande will not insulate anything.Better to use a non foam caulk between the metal flange and the wood floor.You will be much happier.
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Old 10-28-2011, 11:01 PM   #11
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Metal floor vent out of shape


Those ducts used for floor vents are probably the most consistently poor quality workmanship that exists in home building. I have never understood why those guys don't take any more pride in their workmanship than they do. I have been fighting with those fittings for years.

There is a foil duct tape that may work for closing up the gaps without fear of overheating the foam. The foil looks like a roll of duct tape and the adhesive is very sticky.

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