Limit on number of turns in a vent?

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by Sluggo, May 10, 2014.

  1. Sluggo

    Sluggo Member

    Mar 28, 2014
    I'm running a 2" vent for a new shower and sink. It's taken three 90 degree bends (all are more than 6" above the flood elevation of the sink) to get to where I need to go up through the roof. However, I encountered another obstruction and need to offset one more time. I can do this either with two more 90's or with two 45's. I've seen conflicting info on the web about turns in venting with some places saying that you are limited to the equivalent of four 90's and others saying there is no such limit. I'm in the Seattle area. Advice please?
  2. Terry

    Terry Administrator Staff Member

    Aug 17, 2004
    Bothell, Washington
    You have already upsized the vent from 1.5" to 2.0"
    Even so, in Seattle you can have all the bends you want on the vent. You're fine :)

    Just for laughs though, I had a Seattle inspector that wanted to turn me down for using a 2" vent in a situation like that. I couldn't believe my ears when I heard his explanation. He was worried that about somebody in the future being confused. I asked, "Confused about what?"
    I called the head inspector and he was as confused as I was as to why making a vent bigger than needed could ever be a problem. Nope, I'm not making that one up.
    Last edited: May 10, 2014
  3. Sponsor

    Sponsor Paid Advertisement

  4. hj

    hj Moderator & Master Plumber Staff Member

    Aug 31, 2004
    Cave Creek, Arizona
    quote; He was worried that about somebody in the future being confused.

    HE must have been one of those who got fired from Home Depot because he did not meet their minimum standards., so he became an inspector.
  5. Gary Swart

    Gary Swart In the Trades

    Sep 1, 2004
    Yakima WA
    That's cold!! LOL
Similar Threads: Limit number
Forum Title Date
Plumbing Forum, Professional & DIY Advice Limit run time of well pump May 31, 2017
Plumbing Forum, Professional & DIY Advice Freeze clamp limitations? Oct 12, 2016
Plumbing Forum, Professional & DIY Advice Grohflex max and min limits Aug 1, 2016
Plumbing Forum, Professional & DIY Advice Please help me limit my trips to the hardware store for this faucet leak Jun 29, 2015
Plumbing Forum, Professional & DIY Advice Trenchless Sewer Line Limitations? Aug 13, 2014

Share This Page