venting code
In Oregon :
1-1/2" trap arm = 3'6"
2 " trap arm = 5'0"
3" trap arm = 6'0"
4" and larger = 10'0"
Now for your closet flange, the measurement is taken from the top of the flange along the centerline of the pipe to the point where the vent intersects the trap arm. All vent fittings must come off the top and remain vertical to a point not less than 6" above the flood level rim of the fixture being served before offsetting horizontally to connect to another vent.
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Journeyman Plumber
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