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When a vent is less than 10 feet high, the vent should be at least as large as the flue collar outlet.b) Vents for draft hoods or flue collars 12 inches in diameter or less should NOT be reduced more than one pipe size.
A toilet vent needs to be off the top of the pipe that carries the waste to the sewer stack or use a Wye off the vertical 3 pipe from the toilet flange. Code: Toilets must have a vent off the top of the 3 pipe that carries the waste to the sewer stack. The vent pipe attaches with a 3-3-2 Wye to 2 vent pipe (2 vent is the minimum for toilet vents). It is best to use regular sweep elbows when changing the direction of vent lines.