Fart Fan exhaust venting to a bathroom vent? Home › Forums › Public Forums › General Plumbing › Fart Fan exhaust venting to a bathroom vent? This topic has 2 replies, 3 voices, and was last updated 19 years, 12 months ago by Selgas. Viewing 2 reply threads Author Posts 7 Oct 2003 at 12:44 am #277026 MasterPlumbersKeymaster Can I vent a bathroom exhaust fan duct into the bathroom 3 inch vent pipe rigth at the roof line rather than cut anther vent pipe openning into the roof? can exhaust fans be vented to the underside of a soffet? 7 Oct 2003 at 10:16 am #295263 Retired plbg1Participant No on vent pipe, the other question you better check your local code. 14 Oct 2003 at 4:38 am #295264 SelgasParticipant Have to agree with Retired Plumber with a definite NO to the vent pipe connection. Can’t see any problem whatsoever with a ducting vent discharging through a soffett in fact down here they make them with fittings to do exactly that. Selgas Services LtdCraftsman Gasfitters, Plumbers, Electrical Service Technicians Author Posts Viewing 2 reply threads You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In