With the problem of lightning burning thru the thin wall of CSST, and
subsequent bonding requirements now enforced by code officials, is running
CSST or flexible gas connectors thru the side of the furnace allowed by
mfg's. installation inst?
The practice is not a code violation in itself but mfg. instructions trump
code. I have seen several installation instructions that state the furnace
is designed to be connected with steel pipe, street ells, unions, etc. Kind
of vague but none I have seen said run CSST or flexible gas connector
straight to the regulator valve.
I can't think of a worse place to have a hole punched in the gas line than
at the edge of the furnace cabinet. Probably would happen in the middle of
the summer, during a lightning storm, and go undetected until the furnace
lights for the first time in the fall.
98% of the furnaces I see have black pipe extending to the exterior of the
furnace cabinet where CSST or other pipe connects. It's the other 2% that I
have a problem with. If the majority of mfgs. require using a heavy steel
pipe to the exterior, I would like to know.
Thanks in advance