vents Home › Forums › Archives › Old Bulletin Board Archives › vents This topic has 1 reply, 2 voices, and was last updated 21 years, 3 months ago by Paul Edwards. Viewing 1 reply thread Author Posts 30 Oct 1999 at 2:12 am #284688 skoretsk Where and how many vents are needed on drains including toilets? 30 Oct 1999 at 2:03 pm #308554 Paul Edwards Each p-trap must be vented to the outside air. But sometimes several fixtures use the same vent pipe. Vents must be very close to the p-trap they serve, or they wont work. Author Posts Viewing 1 reply thread The forum ‘Old Bulletin Board Archives’ is closed to new topics and replies.