Venting a powervent hot water heater

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    • #276946
      Avatar photoMasterPlumbers

        When I attatch the pvc elblow to the top of water heater it is touching the bottom of the joists. The problem is I then need to run the vent along the bottom of the joists for 10 feet then turn between the joists for another twelve feet. The first run wont have any upward pitch, in fact it would need to drop about 1 1/2 inches and then once it got to the turn the next run would rise 5 inches between the joists. Since the exhaust is being pushed by a fan is that small decline in the first leg exceptable. My gut instinct says the 3″ pvc vent pipe should be pitched upward but I’m not sure how I’ll be able to do that. Does it?

        Thanks ahead.

      • #295083
        Avatar photoDUNBAR

          Vent pipe cannot lay level in any portion of that line. Nor can it have any spots where moisture can collect. It must have proper rise according to product specs.

          Need to look up specs on the heater your installing; every turn of direction you put in a power vent system, you must subtract that from the total distance travelled.

          And from the way it sounds, you are well beyond specs for three inch; 4″ is probably what your plumbing inspector would require.

          » This message has been edited by DUNBAR on 05 September 2003

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