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