I was told years ago that Trakpipe was capable, but not rated for
outdoor useage.. Some question about the coating being susceptible to
UV. Call your plumbing inspector. The other one I am not aware of.
Do you mean saftey as in flexable gas connectors? It seems to me, that
flexable gas connectors are also made of stainless steel with a plastic
rubber coating. The only difference is the connection.
On a roof installation, penitrating the roof seems just easier and safer
considering all the fittings needed to go from a flexible line to iron then
back to flexible again and to iron again. i.e. flexible Trakpipe through
the interior unitl you reach the area where you exit on to the roof. Brass
fitting to iron, exit with iron on to the roof. Then you switch back to a
flexible gas connetor [24"] to iron piping again to the enteror of the unit.
It seems like less fittings is better for a chance to leak.
I haven't browsed through the code yet, just wondered if anyone else has?
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