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HVAC question about ductboard #5458926 06/21/20 05:55 AM
Joined: Mar 2004
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Donald Offline OP
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I have a 2x2:return duct where a 12" flex duct is attached in horizontal. The connection is not tight and I can see some yellow of the ductboard fiberglass. What will stick best to the bare fiberglass. Mastic? Foil tape?
Obviously replacing that section of duct would be best but for now I would like to try and repair.


2015 Ford F-250 w/Powerstroke
2016 Subaru Crosstrek CVT (wife's)
Re: HVAC question about ductboard [Re: Donald] #5458986 06/21/20 08:20 AM
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irad Offline
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There is a duct tape with UL code 181B-FX. This is not the aluminum foil adhesive backed tape but a silver Mylar tape.

Re: HVAC question about ductboard [Re: Donald] #5459126 06/21/20 10:51 AM
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Donald Offline OP
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What's is a good brand of high quality duct mastic (paste)? Not the cheap stuff.


2015 Ford F-250 w/Powerstroke
2016 Subaru Crosstrek CVT (wife's)
Re: HVAC question about ductboard [Re: Donald] #5459132 06/21/20 10:59 AM
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PowerSurge Offline
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Design Polymerics mastic.

Re: HVAC question about ductboard [Re: irad] #5459359 06/21/20 06:20 PM
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Donald Offline OP
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So any tape that says 181B-FX?


2015 Ford F-250 w/Powerstroke
2016 Subaru Crosstrek CVT (wife's)
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