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Thread: AUF question

  1. #21
    Join Date
    Mar 2006
    Eden Prairie, MN


    I use a row of firebrick just inside the door like William does. Also, make sure you distribute the wood evenly when firing so there are no open spots for the air to bypass the fuel.
    Last edited by RileySugarbush; 11-05-2017 at 01:08 PM.
    2x8 Smokylake drop flue with AOF/ AUF
    180 taps on sacks
    60 on 3/16 tubing with shurflo
    Eden Prairie, Minnesota

  2. #22
    Join Date
    Jan 2006
    Oneida NY


    Wood distribution is likely the biggest cause of the air bypassing the fire. Don't have any voids for air to bypass thru. I haven't in the past, but I'll try adding a row of firebricks just inside the door to see if I get an even better boil rate, good idea I hadn't thought of yet.
    Dave Klish about 1320 taps in '15, down to about 700 in '16, up to 1000 for 2019?
    2012 Mahindra 36 HP 4x4/ loader/cab/heat/AC:-)
    added a gooseneck equipment trailer and F350 to tow it to haul more sap
    3x8 raised flue evaporator
    250 GPH converted to electric, RO by Ray Gingerich
    6.32 KW solar system, 1.48KW is battery backed up, all net metered
    website: www.cnymaple.com

  3. #23
    Join Date
    Aug 2017
    Cortland, OH


    I use to have a Leader Half Pint, we added a centrifugal fan to the draft door. Not ever sure how many CFM the fan was, stole it off our old wood burner in the shop. But we run an electric cord to a switch box that we left on the floor right next to front door of the evaporator and then wired to the fan, the switch box has an on/off switch for when you are firing, and it also is wired through a rheostat (a light dimmer dial) so that we can easily adjust the air flow based upon our needs. You will find that sometimes you need to change air flow quite often, based on wood quality, stack temp, boil, etc., so the rheostat is extremely handy, and you don't have to worry about restricting air flow.

  4. #24
    Join Date
    Apr 2017
    Central Maine


    Actually stumbled onto something that I think will work for auf. I found my old spray paint blower... I forget the make (cheapie Graco I think). Anyway, I have a a.c. motor variable speed control that I have adapted to it. My 2x4 is custom built so I am planning to trade for a few modifications including an adapter to the auf vent. If it all works out, I will post video in a month or so. Right now I have to get my uncles place ready for a renter in a month.
    2017- Started small- 90 taps and made 7 gallons. Long days and a few nights on a 1x2 and turkey fryer. Did a lot of reading. Caught the bug!

    2018- Bought a homebuilt 2x4 and built a small scale RO. # of taps? More then last year, 225, maybe more, with about 90 on vacuum.

  5. #25
    Join Date
    Dec 2015
    Old Lyme, CT


    I made a barrel stove and rigged up a blower fan.

    stove 2.jpg

    stove blower.jpg

    I used a flexible metal dryer vent tubing, some black pipe, and duct tape to connect it to the bung hole in the barrel stove lid.

    The blower was 125 CFM, if I remember. I had it plugged into a cheap rheostat that allowed the speed of the fan to be adjusted as needed.

    barrel evaporator 2-16.jpg

    Worked great.

    Mason 2x4 w/raised flue pan, 240 gal. sap tank, 80 Reds on 5/16 tubing and Lunchbox releaser/pump, 20 sugars on buckets

  6. #26
    Join Date
    Mar 2005
    Albion PA


    AUF: some air is way better than none, too much and you will know it. Some trial and error on that. But keep in mind that thousands of gallons of syrup have been made in the old days with no AUF. Just because it seems like everyone is doing it, you don't have too. A rig set up to have good draft will roar on its own with no AUF help. The amount you gain from wood savings and or increased boil rate is going to be hard to see and maybe hard to justify with no electric in the sugarhouse. Maybe a 5 to 15% improvement in efficiency????
    Just my 2 cents. Have fun. Try it and let us know. Pictures are always helpful too!
    Casbohm Maple and Honey
    640 ish roadside taps
    3x10 King, WRU & preheater, AOF [TRS] and AUF
    SIRO Filter Press.
    2015 Ford F250 PSD sap hauler
    One hives of bees
    One Golden named Maggie Cat named Lucy
    Too many Cub Cadets
    Ford Jubilee and several Allis WD's, and IH tractors


  7. #27
    Join Date
    Mar 2016
    chester, ma


    I have some other improvements/fixes I need to make to my evaporator, and limited time (baby!) So I will at least start the season with the other improvements but without the AUF. If time allows, I may add it mid-season. That'll give me an apples-to-apples comparison of what kind of improvement just that makes in boil rate.

    2016: First year. Homemade evaporator out of little woodburning stove with steam tray pans. 6 taps on buckets. 1.1 galls syrup
    2017: Same little homemade evaporator, but souped up. Still 2 steam tray pans. 15 taps on buckets. 4.5 galls syrup.
    2018: Same setup. Limited time (New baby!) Downsized to 12 taps and short season. 2.2 gallons syrup.

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