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Thread: 3 inch diameter vent connects
04-26-2011, 08:16 PM #1
3 inch diameter vent connects
04-27-2011, 05:02 AM #2
Re: 3 inch diameter vent connects
The vent size is determined based on the tables in NFPA 54 and takes into consideration height, lateral lentgh, number of devices and BTUH ratings.
Exception: A three inch dia. vent shall not be connected to a four inch dia draft outlet.
ALSO, Those gas water heaters are piped in series. When piped in series the total pressure drop is greater and the first device will age faster than the second. Not a problem, just something to consider. I prefer to see heaters piped parallel vs. series.
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