Thread: Draft hoods , combustible material

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Originally Posted by Jeff Eastman

Would you consider PVC (used for water supply) combustible material?

PVC is not allowed for use as water supply/water distribution piping.

See the other tread and the code references given there.

If it's cpvc, I believe it should be at least 18 inches from the hot/cold connections at the WH.

Originally Posted by Jeff Eastman

Draft hoods need 6 inches clearance from combustible material correct?

I believe so, yes.

It is 6 inches, just like single walled vent connector. Even if B-vent is sitting on top of the draft hood, the clearance is from the hood itself. I find melted pipe insulation all the time.

Jeff, the definition for non-combustible is ASTM E-136 or essentially Superman's cape. Do you think PVC can withstand a 1,382F vertical tube furnace without bursting into flames, crumbling apart or losing 50% weight? FYI, even Wonderboard cannot pass this test.

So that's why your not supposed to "pull on Superman's Cape..."

So the song goes

Originally Posted by Bob Harper

non-combustible is ASTM E-136 or essentially Superman's cape. Do you think PVC can withstand a 1,382F vertical tube furnace without bursting into flames, crumbling apart or losing 50% weight?

1,382 degrees F, guess that is 750 degrees C?

I like your "Superman's cape" explanation of that test. I may steal it for use now and then.