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toilet should have a vent with in three feet of down pipe, but as long as you are with in the drop range for hori. pipe run you can go as far as you want, but you need that air vent close as you can so that the suction from the toilet water does not pull the rest of water from toilet base(p trap).

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18y ago
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13y ago

According to International Plumbing Code table 906.1 the maximum distance any trap can be from its vent is no more than 4 x's the pipe diameter. However the trap of a toilet is an integral trap, and is also above the vent serving it. In other words the trap itself doesn't rely directly on the vent to maintain its seal. The fixture drain serving the toilet must be vented to relieve back pressure caused by the toilets flush cycle. There isn't a clear cut answer in the International Plumbing Code, but in my opinion it's best to stick with table 906.1 and keep it within 4 pipe diameters (ie: 3" pipe x 4 = 12') of your vent.

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10y ago

5 feet

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Q: What is the maximum distance of a water closet trap from a vent line?
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