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Answered 2006-04-04 18:39:08

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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Can the roof venting of a toilet be upstream of the toilet flange?

Most of the time they are. Depends on how far of course. Usually, the toilet is by the main stack so it only has to go the 12 to 16 inches to get to the drain. The main stack goes through the roof for the vent for the whole house or the bath and laundry. As long as the toilet is getting venting from somewhere, it should still flush.

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