Length of foot vent Home › Forums › Public Forums › General Plumbing › Length of foot vent This topic has 1 reply, 2 voices, and was last updated 20 years, 8 months ago by Retired plbg1. Viewing 1 reply thread Author Posts 17 Nov 2003 at 10:08 pm #277088 MasterPlumbersKeymaster How long can a foot vent be on a loop vent system 18 Nov 2003 at 12:23 am #295391 Retired plbg1Participant Where I live there was no lenght on foot vent, UPC. Check your code book as long as you keep it the same size and have right fix. units, is it above are below ground, If i remember in ground was 10′ above was 30′ Author Posts Viewing 1 reply thread You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In