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Using a typical 1/4" per foot fall (slope) on a 1 1/2" drain, such as a sink drain, the vent must be within 6 feet of the trap to avoid falling below the drain level, and thereby not functioning as a vent.

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15y ago

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Should the trap be before or after vent or condensation drain?

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What is the maximum distance of a water closet trap from a vent line?

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What is the proper way to run a condensate drain with a trap Does it need a vent?

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What does a shower drain plumbing diagram typically include?

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