Thread: Furnace vent initial rise

I know that water heaters must have an 18" vertical rise befor the first transition.

Is there a rule for gas furnaces?

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I'm not aware of a 18" requirement for any gas appliance.

This questions comes up here often, this is likely the most useful (if somewhat ... err.. contentious) iteration, see the second version of Jerry Peck's .pdf, near the middle of the thread.

http://www.inspectionnews.net/home_i...ust-slope.html

Most gas water heaters I have seen with draft hoods have a 6" requirement before any change in direction.

Originally Posted by David Bell

Most gas water heaters I have seen with draft hoods have a 6" requirement before any change in direction.

!2 inches.

Show us where it only requires 6 inches.

Here is an example

Originally Posted by David Bell

Here is an example

Thank you,

Q. Now, however, when you take the code's connector rise chart minimum of 1 foot and try to match that with that manufacturer's drawing (do you know how old that is?) what do you end up with?

A. The most restrictive shall apply. (From the codes.)

Are those not B-Vent requirements? Show me single wall pipe requirements.

I see this form time to time.

Best

Ron

Originally Posted by David Bell

Are those not B-Vent requirements? Show me single wall pipe requirements.

First, go back and review the drawing you posted.