Return Air Seal


  #1  
Old 05-21-15, 08:26 AM
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Return Air Seal

My framing/electrical inspector said that the insulated foil "squares" were not code anymore for sealing off the return air ducts in the ceiling. He said to use wood or metal. So I cut some 3/4" plywood to size and put those in place of the foil insulation caps.
My question is what can I use to seal the little gaps between this new wood and the sheet metal for the duct? Can I use the gap filler foam, foil tape, caulk or something different? Didn't know if there was something special I had to use for this since it involved air quality. Also, if I can use the Fireblock foam, that would be great as I already have a can open.

Hope all that makes sense.
Thanks for the help!
 
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Old 05-21-15, 08:44 AM
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Not sure what insulated foil squares are. Can you post pics?
 
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Old 05-21-15, 10:09 AM
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The first picture was what was originally sealing off the return air. Second pic is the wood I replaced it with. Just wanting to know what I can fill those gaps with around the wood.

Thanks!
 
  #4  
Old 05-21-15, 11:00 AM
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Oh OK, that's duct board ( I hate that stuff ). I would just use some caulk on that.
 
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Old 05-21-15, 11:18 AM
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Just any kind? Sorry for the basic questions. And thanks for your responses!
 
  #6  
Old 05-21-15, 11:29 AM
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I just added/modified some duct returns at my house and my ac buddy said only use mastic for all joints and sealing needs of rigid duck work including ductboard.
 
  #7  
Old 05-21-15, 12:46 PM
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Mastic is good stuff but I think that's a bit overkill for this. I would use a good silicone caulk.
 
  #8  
Old 05-26-15, 02:54 PM
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International Mechanical Code of which has been adopted in most of the States. Accepts only Pooky (trade slang), Duct sealer or a mastic product to seal cracks or gaps in duct works. Foil tape, duct tape or silicone sealers are not acceptable.
 
 

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