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Rick
Rick, HVAC Supervisor
Category: HVAC
Satisfied Customers: 19494
Experience:  40+ yrs. experience as a licensed oil & gas technician.
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Flue vent connectors from furnace to chimney are usually of

Customer Question

Flue vent connectors from furnace to chimney are usually of single wall steel (either galvanized or stainless), but I have just seen a home where flexible stainless steel dryer vent pipe was used to replace several runs of steel pipe both in horizontal runs and in 90 degree elbows. What does the code say about this?
Submitted: 1 year ago.
Category: HVAC
Expert:  Rick replied 1 year ago.
Stainless steel flex is approved for chimney liners not for vent connectors. Do you want the specific code language?
Customer: replied 1 year ago.
yes please
Expert:  Rick replied 1 year ago.
NFPA 54 (National Fuel Gas Code) 12.11.2.4 approved vent connector material.(1) (d) Stainless steel sheet (my emphasis) not less than 0.012" thickNo mention of flex. There is a provision allowing a listed vent connector. So to pass an inspection documentation for that flex stating it's a listed vent connector would have to be provided.