by 
patrick
ANSWERS: 3
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I have five and they are working fine. Cheers
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Are you talking wet vents or auxiliary venting? If you are referring to wet vents, the size of a wet vent is based on the total fixture units it supports: a 3" wet vent can serve up to 12 fixtures units; a 2" wet vent is rated for 4 fixture units; a 1 1/2" wet vent is for only one fixture unit. PLus the distance between the wet-vented fixture and the wet vent itself shouldn't be greater than the maximum critical distance (that's the distance between the drain trap and the vent pipe): 3" vent is 6 feet, 2" vent is 5' and a 1 1/2" vent is 31/2'. You might want to check with your local codes as it can differ for each area.
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You can have 24 fixture units on an 2" vent.
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