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Last edited by BobsPlumbing; 07-05-2010 at 09:58 PM.
the thought is that the 5' hot metal vent pipe will create a draft. but then again with an outdoor unit, is a draft really that important.
the code does not differentiate between the minimum vent length from indoor and outdoor.
of course the water vapor/ condensation is another reason to vent above the roof along with the possibility of combustion gases getting into an open window.
phoebe it is
So much for 2' above anything within 10' NFPA/ANZI venting code.
Wnidows are 4' and 4' but differ if a direct vent.
Aquahut/water heater shed. Where does it attach but to the house. 5' and 1' vents.
NFPA calls for the vent termination to be 3' above the roof line and 2' above any permanent structure within a 10' horizontal plane. That includes the house behind the shed. NFPA 54-09 126.96.36.199
Who cares about exhaust spillage outside? Single wall or B-vent? A larger purpose of B-vent is to minimize the space required from combustable surfaces. Single wall is 6". B-Vent is 1". That is handy on one hand and useless on an outdoor metal shed.
For those that are so confident in sizing. Please explain to others why 4-200,000 btu natural gas units provide 32gpm+ and not the 10gpm described.
For those that are offended by help with sizing...get over it. While you may be a pro and know, you are not the only people looking at this. There are DIY looking at this and not logged in. Infact with the way this forum behaves I don't blame them. Why would they want to? It is much safer to learn from a destance than jump into the fire. What type of forum is that, when people wanting to learn are already put off?
Last edited by Kevin Jones; 07-06-2010 at 10:55 PM.
This could get finicky in interpretation as the code may not directly address a "Hut".
It doesn't attach to the structure at all. Not one fastener. So do the gas/vent/plumbing rules noted apply?
And while the other code you listed does apply to venting....were they thinking of including things such as this?
That's a tough one, but maybe a good one. I keep thinking of the different roof lines encountered and how potentially high and crazy a vent could/would get if this was followed to the letter even if it was an outdoor closet designed into the original structure.
Some of those have small A-roofs. You would have to go out of them, then 20', 30', more? to get past other parts of the structure. Isn't there a maximum vertical distance on regular vent FVIR heaters?
So much to think about....
I won't address the rest. I'm here to learn as much as I can. May not always agree, may debate out of hand once in a while, but move on to learn something else.