This venting method requires a relief vent equal to the size of the vent stack

This venting method requires a relief vent equal to

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Size of Soil Waste Stack (in) Fixture Units Connected Diameter of Vent Required (in) 1 1/4 1 1/2 2 2 1/2 3 4 5 1 1/4 2 30 1 1/2 8 50 150 1 1/2 10 30 100 2 12 30 75 200 2 20 26 50 150 2 1/2 42 30 100 300 3 10 30 100 200 600 3 30 60 200 500 3 60 50 80 400 4 100 35 100 260 1000 4 200 30 90 250 900 4 500 20 70 180 700 5 200 35 80 350 1000 5 500 30 70 300 900 5 1100 20 50 200 700 Maximum length of stack vents, vent stacks and relief vents
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