Manage the draft

Discussion in 'Wood Smokers' started by graperadio, May 15, 2009.

  1. I have a Klose unit with an offset firebox. I think there is no better unit made today.

    When controlling oxgen in the smoke, one has the choice of the intake by the firebox, and/or the exhaust on the chimney. I tend to adjust the intake over the exhaust. I like to keep the exhaust fully open whenever possible.

    I have discovered that if I give emphasis to the exhaust, I get more deposits on the meat I am smoking. I have tested this extensively and measured PPM in the smoking chamber , and have confirmed that I get more particulates when partially closing the exhaust Vs the intake. However, I know this goes against common practice. Any comments?
     
  2. rickw

    rickw Master of the Pit OTBS Member

    I was taught, here and elsewhere, to always keep the stack vent fully open and control temps by intake only. So what you describe is not against common practice but is actually common place.
     
    mudfarmer likes this.
  3. bigbaldbbq

    bigbaldbbq Smoking Fanatic SMF Premier Member

    Exhaust fully open, always.
     
  4. jaxgatorz

    jaxgatorz Smoking Fanatic OTBS Member SMF Premier Member

    What they said ^^^^^^^^
     
  5. Then why is there an adjustment mechanism on the exhaust if it is always kept fully opened?
     
  6. rickw

    rickw Master of the Pit OTBS Member

    It is also called a rain cap, to keep the rain out.
     
  7. I would have put a spark arrestor which could have served the same purpose and added a feature the unit could use.
     
  8. bbq engineer

    bbq engineer Master of the Pit OTBS Member SMF Premier Member

    Eshaust fully open...always. Control the draft at the intake.

    The exhaust damper is so you can identify if the operator knows what they are doing [​IMG]! Seriously, I believe it is for storage to close it up or to keep the rain out.
     
  9. jdt

    jdt Smoking Fanatic SMF Premier Member

    I just thought it was there for smoke signals [​IMG]
     
  10. bbq engineer

    bbq engineer Master of the Pit OTBS Member SMF Premier Member

    I had a buddy that was having a party about 5-10 miles from his house, and since he was doing a lot of smoking, started at his house EARLY to make sure that all of his stuff was done for the party. Mid day, he moves his operation the 5-10 miles...closed up the dampers and trailed the whole rig over to the party site. In this case the dampers made the rig road worthy so ash / fire weren't blowing around on the food and or the road. Worked like a champ.
     
  11. pinkmeat

    pinkmeat Smoking Fanatic

    I would say the rain theory is incorrect. Look at the way a Lang is designed. It has a cover on it already and an exhaust. I think the stack damper helps to slow the fire a little when closed a little...like 45deg. Fully open would increase the draft. I kind of played with it on Mother's Day, but didn't come up with any concrete results other than I could get it hottest with the stack damper fully open..
     
  12. rickw

    rickw Master of the Pit OTBS Member

    I'm sure using the stack vent as a temp control method is a viable option but I can't say I have read it to be the recommended method of temp control.

    Seeing my Horizon only has the vent cap and it is recommended that it be operated fully open; looking at it as a rain cap makes more sense to me than looking at it as a means of temp control. Even the uds is ran with the vent always open with a rain cap on when not in use.
     
  13. coyote-1

    coyote-1 Smoking Fanatic

    I make one exception to this rule. On windy days you can get a backdraft, wind blowing into the exhaust and mucking with temps and overall smoke. So I'll close it down a bit, and point that side into the wind. It is always the firebox side, since I point the firebox into the wind... I also then have to close the firebox damper a bit to prevent too much airflow.
     
  14. rickw

    rickw Master of the Pit OTBS Member

    Isn't that what a uds is for [​IMG]
     

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