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well endless unless you make it turn 50 times but because air travels threw the turns with relativity minimum restriction and the upc code book has a maximum length for each size of vent pipe and if you make it one pipe size bigger it then it has no limit of length before exiting out of a building.

Venting is based on developed length of pipe and fittings BUT unlike water, friction losses are not calculated in.

As long as the vent grades up away from the fixtures trap it serves you will not have a problem and ((where you have a possible condensate situation you may have to install a drip leg (behind) the trap of the fixture)) <-- doesn't makes sence.

Another cause for a to become ineffective is if someone who lives in a colder climate does not take hoarfrost into consideration when sizing a vent terminal as the vapor cannot flow through the pipe < no hoarfrost but snow covering the pipe.

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