Re: 6' vent for two Furneces + WaterHeater(s)
Posted by hj on April 11, 19100 at 01:27:36:
In response to Re: 6' vent for two Furneces + WaterHeater(s)
The 6" was a little small for the original setup, but you need a 7" pipe for either of your two options.

: I have vent pipes 2x4' from two furnaces and 3' from
: 50 gal waterheater. All of them goes into 6' main vent.
: That how it was made 20 years ago.
: Now I am Going to change 50 gal to 75 gal or just add
: one more 50 gal, and I have to change Water heater vent from 3' to 4' for 75 gal (will be 4'+4'+4'=>6') or add one more 3' vent pipe (will be 4'+4'+3'+3'=>6')
: My question is about main vent line, - is 6' enough
: for both caces or not? Was it deigned correct from the beginning?

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