combustion test port

[3450BB]

Hello. I saw that there is an accessory that installs in the 2" pipe, but I did not see that being mandatory in the code book. Couldn't I just make a 1/4" hole and fill it with high temp?

[Admin]

They used to allow us to use plastic plugs to seal the hole but I believe TSSA no longer allows this.  I heard they would be making it mandatory for every furnace install to include this test tee, but I haven't seen anything yet.

Clause 8.10.4 - A special venting system or a BH venting system shall be installed in accordance with the terms of its listing and the appliance and vent manufacturer's certified installation instructions.

Download the IPEX brochure - Here

Drilling small holes into the vent line and plugging afterwards is no longer a permitted practice.

[3450BB]

I went out to my local supplier, Boone and they had the bushing in stock in either PVC or CPVC. It installs into a tee.
The port of the plug is threaded. The man at the counter said no dope on it, but I'm not sure that would pass an inspection.
Should I leak lock it for good measure or use metallic pipe dope? or even glue it once done with the analysis?


I have a new Bacharach analyzer and its manual just points to a region at the exhaust, no measurement. But I'm going to install it so the port is 7" from the top of the furnace cabinet.

[Admin]

That sounds like what is shown in the IPEX test tee brochure above.  You should be good to go.