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Thread: Draft door open or closed with AUF

  1. #1
    Join Date
    Apr 2018
    Location
    North Hastings ON Canada
    Posts
    28

    Default Draft door open or closed with AUF

    Added a 273 cfm squirrel cage blower to my arch. The arch is not an airtight, it’s natural draft. Any thoughts on whether the draft door should be open or closed when the blower is on? Thanks in advance for any feed back
    Rob

    2017- 75 taps 21 liters of syrup, 20x48 sugar shack
    2018- 150 taps 35 litres syrup 2x6 Lappiere evap, Auf, steamhood
    2019- 200 taps?- 150 on buckets- 50 on 3/16- the 3/16 still in the box due to time and weather this year- 43 liters syrup- tapped for week and a half
    2020- 204 taps- 170 buckets- 34 3/16 gravity tapped March 19th
    Kawasaki Mule Pro FXT SXS on Tracks- sap hauler
    Wife and kids who like sugar’n almost as much as me.

  2. #2
    Join Date
    Jan 2006
    Location
    Oneida NY
    Posts
    11,582

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    Keep it closed. The blower will give it all it needs, better than the draft door, and if you leave the draft door open you could lose some of the blower air which could blow out the open door rather than go up to give air to the fire.
    Dave Klish, I recently ordered a 2x6 wood fired evaporator from A&A Sheet Metal which I will be converting to oil fired
    Now have solar, 2x6 finish pan, 5 bank 7x7 filter press, large water jacketed bottler, and tankless water heater.
    Recently bought another Gingerich RO, this one was a 125, but a second membrane was added thus is a 250, like I had.
    After running a 2x3, a 2x6, 3x8 tapping from 79 taps up to 1320 all woodfired, now I'm going to a 2x6 oil fired and a 200-425 taps.

  3. #3
    Haynes Forest Products Guest

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    You will be making your arch air tight. I have seen some awful smokey sugar shacks from the smoke that will blow out from the smallest of cracks around pans and doors. You are pressurizing the inside of the arch and the smallest of cracks will puff out smoke.

  4. #4
    Join Date
    Apr 2018
    Location
    North Hastings ON Canada
    Posts
    28

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    Quote Originally Posted by Haynes Forest Products View Post
    You will be making your arch air tight. I have seen some awful smokey sugar shacks from the smoke that will blow out from the smallest of cracks around pans and doors. You are pressurizing the inside of the arch and the smallest of cracks will puff out smoke.
    Sp Haynes you would suggest leaving it open?
    Rob

    2017- 75 taps 21 liters of syrup, 20x48 sugar shack
    2018- 150 taps 35 litres syrup 2x6 Lappiere evap, Auf, steamhood
    2019- 200 taps?- 150 on buckets- 50 on 3/16- the 3/16 still in the box due to time and weather this year- 43 liters syrup- tapped for week and a half
    2020- 204 taps- 170 buckets- 34 3/16 gravity tapped March 19th
    Kawasaki Mule Pro FXT SXS on Tracks- sap hauler
    Wife and kids who like sugar’n almost as much as me.

  5. #5
    Join Date
    Jan 2006
    Location
    Oneida NY
    Posts
    11,582

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    I guess smoke escaping would depend on how good the draft is on your rig. I never had smoke escaping mine and it is not airtight. Mine has almost a 1/4" space between the feed doors and when I just had a 400+ CFM blower it did not smoke, nor does it ever with my high pressure OAF/AUF. If you get smoke, add more stack height. Mine is 19' high with my 3x8, it was also the same height back when I had a 2x6 because I have 10' walls, a steep roof and it extends at least 2' above the cupola which is only about 2.5' away..
    Dave Klish, I recently ordered a 2x6 wood fired evaporator from A&A Sheet Metal which I will be converting to oil fired
    Now have solar, 2x6 finish pan, 5 bank 7x7 filter press, large water jacketed bottler, and tankless water heater.
    Recently bought another Gingerich RO, this one was a 125, but a second membrane was added thus is a 250, like I had.
    After running a 2x3, a 2x6, 3x8 tapping from 79 taps up to 1320 all woodfired, now I'm going to a 2x6 oil fired and a 200-425 taps.

  6. #6
    Haynes Forest Products Guest

    Default

    I'm with Dave on the door being closed. Every rig will act differently and only time will tell if yours will billow out smoke. I have seen a brand new major manufacture with non air tight doors become impossible to run at high fire because of the gaps in the doors. He has plenty of stack and we slammed the doors with fire blanket in them to help get thru the season.

  7. #7
    Join Date
    Feb 2012
    Location
    Fond du Lac, Wisconsin
    Posts
    1,090

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    You can adjust your AUF until it doesn't have any smoke escape by restricting intake. As the evaporator heats up about an hour into the boil it will also draft better. If you adjust your air you can also feed wood without shutting the air down.
    Smoky Lake 2x6 dropflu pans and hoods on homemade arch
    Smoky Lake 6 gallon water jacked bottler
    Concentric Exhaust
    250 Deer Run RO
    325 taps

  8. #8
    Join Date
    Apr 2018
    Location
    North Hastings ON Canada
    Posts
    28

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    Quote Originally Posted by maple flats View Post
    I guess smoke escaping would depend on how good the draft is on your rig. I never had smoke escaping mine and it is not airtight. Mine has almost a 1/4" space between the feed doors and when I just had a 400+ CFM blower it did not smoke, nor does it ever with my high pressure OAF/AUF. If you get smoke, add more stack height. Mine is 19' high with my 3x8, it was also the same height back when I had a 2x6 because I have 10' walls, a steep roof and it extends at least 2' above the cupola which is only about 2.5' away..
    Sounds like I have a similar setup to your old 2x6 with smoke stack height. I’ll fire it next weekend for a trial run and go from there. Appreciated
    Rob

    2017- 75 taps 21 liters of syrup, 20x48 sugar shack
    2018- 150 taps 35 litres syrup 2x6 Lappiere evap, Auf, steamhood
    2019- 200 taps?- 150 on buckets- 50 on 3/16- the 3/16 still in the box due to time and weather this year- 43 liters syrup- tapped for week and a half
    2020- 204 taps- 170 buckets- 34 3/16 gravity tapped March 19th
    Kawasaki Mule Pro FXT SXS on Tracks- sap hauler
    Wife and kids who like sugar’n almost as much as me.

  9. #9
    Join Date
    Nov 2010
    Location
    Bakersfield, VT
    Posts
    241

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    If using a low pressure blower (squirrel cage) put it on a dimmer switch so you can adjust the amount of air put in. I us a sharpie to mark high end, and low end (I leave blower on turned down when I add wood). After a season you will get to know where you need the switch to be at for the hottest fire. Some days will be different then others.
    54 Acres bought in Sept 2010, hope for a lot of fun
    Kabota 3400 w/ bucket
    couple Husky chainsaws and a couple of Stihl
    Big dream
    2011 = 106 on gravity tubing, 100 bucket
    2012 =700 vaccuum 100 gravity 80 bucket's
    30" x 12' Vortex with Leader Revolution Max Raised pans
    2013 = 1200 vac, 200 gravity, 5 buckets, buying from 300 buckets, 500 vac
    Springtech RO 600 Deluxe
    2015= 1800 all vac @ home, buying sap from 1200.
    2017= 2200 all on vac. no longer buying sap

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