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I have an old farmhouse with a bathroom vanity, laundry room, and kitchen sink/dishwasher draining into a single septic run. There aren’t any vents installed in the system with only a crawl space under the two rooms. Is there a way to add a vent in the crawl space or without running it up through the walls or ceiling?

isherwood
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Dave
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1 Answers1

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If allowed in your location an air admittance valve can be added. It needs to be close to the level of the drain. I put them in the sink cabinet as close to the top as I can. I agree with @kris my 1930 farm house has the vent outside several Victorians I remodeled also had them outside. But an AAV if allowed is the easiest but not in the crawl space.

Ed Beal
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