2

Is there a minimum height for the the vent pipe circled in the image?

drain vent pipe height

3

Yeah, the horizontal vent branch immediately to the upper left of your red circle cannot turn horizontal until it is a minimum of 6" above the flood rim of the fixture it is attached to or the highest fixture in a group that it is venting.

This will determine the length of the pipe you circled.

Good luck!

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