If I connected my tub drain to the sink drain with the .25 per foot slope, would it be best to re-vent or is it perfectly okay to leave wet vented. My wife is really concerned about toxic fumes entering the home.

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Originally Posted by Drainless

If I connected my tub drain to the sink drain with the .25 per foot slope, would it be best to re-vent or is it perfectly okay to leave wet vented. My wife is realy concerned about toxic fumes entering the home.

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It depends on how close the tub is to the lavy drain. If the tub is within three or four feet , it will drain and vent but it is not exactly proper. A tub drain functions best when it is in a two inch pipe & is close to a conventional vent. Your lavy is probably an inch and a half pipe.