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Old 11-19-2016, 05:59 PM   #1
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Unions on PVC furnace flu?


I need to service my furnace and I need to cut the 2 inch pipe away temporarily to get out the blower I was wondering is it code to put a union on the inlet and outlet air pipe for the combustion blower?
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Old 11-19-2016, 06:59 PM   #2
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Re: Unions on PVC furnace flu?


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I need to service my furnace and I need to cut the 2 inch pipe away temporarily to get out the blower I was wondering is it code to put a union on the inlet and outlet air pipe for the combustion blower?
No

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Old 11-19-2016, 08:05 PM   #3
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Re: Unions on PVC furnace flu?


If you cut the pipes, you have to reglue with couplings. The fresh air is usually not glued at the furnace collar. The venting will have a rubber coupling. Sometimes gluing is all you can do. Don't forget to use the right stuff. It's 636 or similarly certified.

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Old 11-20-2016, 05:53 AM   #4
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Re: Unions on PVC furnace flu?


Unions are not uncommon in the USA.
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Old 11-20-2016, 10:17 AM   #5
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Re: Unions on PVC furnace flu?


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Unions are not uncommon in the USA.
Really? Interesting. It's completely illegal here.

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Old 11-20-2016, 11:52 AM   #6
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Can you post a code reference that would suggest it's illegal? Do they call it out specifically or did they just say general terms that lead you to believe it's not?

if you torque the union properly I bet it does a better seal than RTV or silicone people use to seal off the furnace flange to the PVC..
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Old 11-20-2016, 03:12 PM   #7
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Re: Unions on PVC furnace flu?


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Originally Posted by zootjeff View Post
Can you post a code reference that would suggest it's illegal? Do they call it out specifically or did they just say general terms that lead you to believe it's not?

if you torque the union properly I bet it does a better seal than RTV or silicone people use to seal off the furnace flange to the PVC..
Because it's special venting. You'd have to find a union rated at 636. Every inspector I've ever spoke to won't even think twice about it.

Silicone isn't 636 rated either BTW.

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Old 11-21-2016, 03:25 AM   #8
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Re: Unions on PVC furnace flu?


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Really? Interesting. It's completely illegal here.

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USA hasn't gone to 636 yet. At least not across the nation.
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Old 11-21-2016, 05:51 AM   #9
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Re: Unions on PVC furnace flu?


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Originally Posted by beenthere View Post
USA hasn't gone to 636 yet. At least not across the nation.
Ah. Good to know. Hard to keep all the rules straight everywhere.

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