UDS Exhaust

Discussion in 'UDS Builds' started by jennenga38, Jan 4, 2015.

  1. I am in the process of building a uds,and my question is about the exhaust port on my flat lid. I plan on using a 6-8 tube screwed into the bung. Can I use pvc to keep the lid lightweight. Would I have melting or chemical issues being on the exhaust side? Please help
  2. jrod62

    jrod62 Smoking Guru Group Lead OTBS Member

    I would stay away from PCV. Still alot of heat coming out the top.
  3. Be sure and post some pictures

  4. dirtsailor2003

    dirtsailor2003 Smoking Guru OTBS Member

    A light gauge aluminum pipe would weigh less than PVC. I wouldn't use PVC, as the of gets hot. On my UDS I dint have anything and it works fine.
  5. daveomak

    daveomak Smoking Guru OTBS Member SMF Premier Member

    That single tube may not be enough exhaust...
  6. dirtsailor2003

    dirtsailor2003 Smoking Guru OTBS Member

    I use the 2" bung and the 1" bung on mine.
  7. phrett

    phrett Smoke Blower

    PVC will melt. Black pipe works and you can adapt it to fit a nice cap to keep out rain and get some draft. The 1" usually works and gives enough draft, but doing the 2" makes sure you are set. It's best to restrict airflow at the inlet rather than the outlet so adjusting temps should be from the bottom.
  8. timberjet

    timberjet Master of the Pit

    You don't need one. I have used the original bung holes for years without issue. When it's really cold out I put a tea cup over the smaller hole and it holds in the heat a little more.
  9. My theory is you need Equal to a little larget Exhaust than Intake.

    Most have either 3 or 4 each 3/4" Intake Ports.

    The 2 Inch Bung should be plenty. It is 3.14 Sq Inches.

    A Weber Dome lid with ONLY 4 each 3/4" Holes is used every day with no issues, and the 4 each 3/4" holes equal only 1.77 Sq Inches. Less than the bung vent.

    I would put a stack of some sort on the bung exhaust vent. The ones that look like a Diesel Tractor Exhaust look pretty good to me. A straight exhaust pipe with a sliding closer like on an Offset Smoker are also not bad.

    Then with a straight piece of exhaust pipe, you can just drop a can over the top to close it off.

    Whatever length you like. Like was said above just the open bung works fine.

  10. bruno994

    bruno994 Master of the Pit

    I buy these for the UDS's that I build...4" diameter damper from KCK.com....The drums I get don't have bungs in the lids, these exhaust plenty.
  11. Neat, I've seen them before


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