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If you've removed the stained project material, the vapor will clear out as soon as you allow it to through adequate ventilation. Some slight lingering odor may remain, but it shouldn't be enough to cause health concerns.


The problem can be solved by draining the vent. Be sure to use a p trap to prevent sewer gas from entering. Yes, the problem could be condensed moisture, but it might also be rainwater that is collecting. Either way, a chimeny cap that is shaped like a cone will cause an aspiration effect (like the negative pressure under an airplane wing) which will ...

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