Join Date: Mar 2008
Location: Anacortes PNW
Thanked 112 Times in 101 Posts
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My fiancee just attended a seminar on marine plumbing during which the lecturer addressed your question. He suggested putting two vents, or a "T" in the vent fitting and running a vent outlet to each side of the boat. The laws of physics and wind will ensure that the smell comes out the leward vent and is carried away quickly.
Hope that helps.
I have a sauna on my boat, therefore I win.
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