Is 3M Sealant ok to use with inducer motor?


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Old 01-10-24, 05:13 PM
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Is 3M Sealant ok to use with inducer motor?

I'm replacing the inducer motor on my American standard furnace.

I found a used motor replacement but it didn't come with a gasket.

Can I use 3M Fire Barrier Sealant CP25WB+ instead?

If so, should I just use a small bead in a complete circle?
 
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Old 01-10-24, 05:48 PM
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That would not be my choice of sealants.

You should be using Permatex ultra red or RTV sealant.
Permatex ultra gasket
 
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Old 01-10-24, 05:51 PM
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Thanks...I'll use that instead.
 
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Old 01-10-24, 06:11 PM
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Just a thin bead. You don't want it to run into the inducer.
 
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Old 01-11-24, 10:03 AM
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Just a follow up...

Home depot claims that they are discontinuing the high temp Permatex. I went to 2 (in Los Angeles) of them and both were out of stock and claiming they won't carry it anymore.

So I used with the 3M stuff. I put a thin bead about an inch from the edge. I could see it just daylighting when I tightened the screws. However, I didn't put any sealant in the screw holes. I believe the inducer fan is used to discharge the off gases, so worst case I have small leakages of CO, CO2 or NOx through these holes, right? I have a CO detector nearby.

Anyway, used motor is running well. I'm not sure if I should junk the old motor assembly or rebuild it. I think if I can get a tested used one for $70, I should just recycle the old one. Any thoughts?
 
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Old 01-11-24, 03:19 PM
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Home Depot may be discontinuing carrying that product but it is available at all auto parts stores.
 
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Old 02-21-24, 10:21 PM
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3m

What if you already used the 3m stuff?

Do I need to reinstall with the stuff you linked?

https://multimedia.3m.com/mws/media/...data-sheet.pdf

“High-performance 3MTM Fire Barrier Sealant CP 25WB+ is ideal for sealing single or multiple through penetrations in fire-rated construction. 3MTM Fire Barrier Sealant CP 25WB+ is typically used in mechanical, electrical and plumbing applications to firestop openings created by the following penetrations in fire-rated floors, floor/ceilings or walls: metallic pipe, plastic pipe (excluding CPVC), conduit, power and communication cable, cable trays, busways, combos, insulated pipe and HVAC duct penetrations 3MTM Fire Barrier Sealant CP 25WB+ is also used to firestop blank openings and static construction joints.“
 
 

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