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Flex SS gas lines


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I see quite a few flexible stainless steel gas lines connecting appliances and water heaters. Is 5 foot the rule of thumb for max length? Are there exceptions to that? I also see them go through the subfloor upstairs to gas fireplaces. Thought that this wasn't allowed either?

Any thoughts?

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CSST is allowed to pass through floors and walls.

One important thing to check for whenever you see CSST in a house is that the gas piping should be bonded to the grounding system of the house.

At some point the CSST is connected to rigid steel gas piping. Check those rigid areas of piping. If you cant find a copper bonding wire of at least #6, call it out.

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