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I have two 2" mains, 30' and 36' long. I am venting each with a 3/4" Hoffman #75 vent. The 30' main volume is .690 cu.ft. - 36' is .828 cu.ft.. The Hoffmans are suppose to vent .96 cu.ft/min at 3 oz. steam pressure. Is a #75 Hoffman enough for these mains or should I increase venting - If so - how much?
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