CSST in furnace cabinet

Seems wrong to me. You can’t run an appliance connector into a cabinet. Logic would say that CSST should be the same. The manufacturer recommends avoiding sharp edges. I’m writing it up. Anyone disagree?

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Nope, they should have run a rigid pipe to the outside of the cabinet and then coupled the CSST.




Can you provide a reference to that? I’ve been through the IFC, IMC, etc., etc. as a result of a previous find similar to this. The codes allow CSST to penetrate an equipment cabinet as long as it is installed per the manufacturers requirements. Gastite allows its piping to penetrate equipment cabinets if the penetration has a protective bushing or sleeve and the equipment will not cause excessive vibrations or movements that can damage the pipe. I would expect it would depend on what the manufacturer of this CSST extension allows?

that is the issue Manny, I have never yet seen one with a bushing, and there’s none present in Joe’s picture either. We all know that plumbers and HVAC techs don’t carry bushings, but as they do carry rigid pipe thats what they should use to transition through the cabinet.




I agree! I have yet to find an installation like this where a protective bushing or sleeve was used. I definitely write it up as lacking protection or use of black iron through the cabinet penetration as an alternative. Either way I call out an HVAC specialist, or plumber, to repair it.

Another question though. I’ve never seen a tail piece made that was as short as this one. Also since the CSST does not have a required identification label on it I would expect it is site fabricated? Are you aware of any manufacturers that make them this short?

Indeed, no bushing. All the CSST was Tracpipe. It’s all site fabricated. The photo doesn’t show that they ran a long section to a shutoff valve, then this short section from the valve to the furnace.

If it were allowed (CSST into cabinet), I would think we would see a lot of it since it is much easier to install than iron pipe.

York County seems to allow the appliance connectors into the furnaces since about half of the newer homes have it. I write it up as improper, the tag on those connectors clearly states this under item 2 but is very small print.

Here is another discussion on this:

Should the CSST be bonded?

Absolutely, and it wasn’t. Wrote that up for the electrician.

All gas furnace piping is bonded via the pipe connection to the furnace valve to the equipment cabinet grounding wire where the 120V connects.
This is a poor bond.

The new requirement is correctly referred to and called “additional bonding”.