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Message: <blockquote data-quote="BobSaintLouis" data-source="post: 2045950" data-attributes="member: 737571">This will vary by your local plumbing code.  I would say to run it horizontal (slight upward angle) thru the cabinets until you are past the bay window.  Then into the wall and vent it properly.  Either by going thru the roof or looping around until you can tie into the existing vent.Remember that what you do now may catch up with you later when you want to sell the house.  If your local city or a buyer inspects the work and finds out there is an improper/illegal vent it could cost you major $$$ to retrofit.Also remember to put in clean out plugs on your drains and shut off valves on the supply lines.Best of luck</blockquote>