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Old 09-05-2012, 07:38 PM   #1
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1974 31' Sovereign
mogadore , Ohio
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Need help installing a 4" gas vent

Anyone know where I can get either a 90 4" vent so i can go out the side or a 4" vent that I can go through the roof of my airstream.
I am installing a wall hung tankless water heater in a closet and I dont know where to start with the vent.
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Old 09-05-2012, 07:58 PM   #2
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Any supplier of plumbing/mechanical supplies will have them. I suspect you'll need a B-vent (they usually have a 4" inside diameter and 6 or 7" outside diameter.
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Old 09-06-2012, 07:09 AM   #3
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Thanks. I'm stuck on how thick the wall/ceiling is and whether to use a vent similar to the fridge vent or more like the vent used on the furnace
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Old 09-06-2012, 08:52 AM   #4
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Quote:
Originally Posted by Marchok
Thanks. I'm stuck on how thick the wall/ceiling is and whether to use a vent similar to the fridge vent or more like the vent used on the furnace
Most AS walls are 1 1/2 inches thick. At least my 1968 is. Fridge vent might be a little over kill. Look at some of the vents on vintage trailer supplies web sight and see if the will work.
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Old 09-06-2012, 11:02 AM   #5
jm2
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gas fired wall hung instant water heaters generally use a coaxial vent arrangement that often projects more than a few inches from their mounting wall.

check with your heater manufacturer for their specification.

if the water heater is built & certified for RV use, the manufacturer will have the right parts available through their normal distribution channels.

if it's not built & certified for RV use, you might want to rethink what you're using.

ymmv.
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