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cant find draft fan thread...

Post in 'The Boiler Room - Wood Boilers and Furnaces' started by barnartist, Mar 13, 2008.

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  1. barnartist

    barnartist Minister of Fire

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    I was ready to purchase a draft fan to help me with smoke on loading...There was a nice thread here somewhere with a link to a suggested fan...It may have been leaddog's...
    I'll be using it only for loading or starting a new fire, so a manual on off switch will be fine.

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  2. sparke

    sparke Minister of Fire

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  3. barnartist

    barnartist Minister of Fire

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    Thanks spark. Does it seem to eliminate the smoke completely? You sound pretty happy with it. How in the heck did you get it for 60??!!
    They want 150 for a new one?
  4. sparke

    sparke Minister of Fire

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    The link I showed you was a different vendor. Go to E-bay and type in draft - inducer. Hopefully you will find an auction on one. The brand I have is Tjernlund. It does a real good job. I rarely get smoke out of the door unless I do something stupid like open open the door at begining of burn cycle... Make sure the fan is rated for wood appliances because the same company makes them for oil and gas boiler as well...
  5. barnartist

    barnartist Minister of Fire

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    I'll be sure to chack it's for wood. What the heck is the difference anyway? I thought I found one for 90 bucks but it said not for wood use.
    I want one to pull some air man. It would be nice to fire up and not need a shower for the WAF.
  6. sled_mack

    sled_mack New Member

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    Are you going to use this all the time, or only when loading wood?
  7. barnartist

    barnartist Minister of Fire

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    only when loading wood. I figure I'll be starting more fires from scratch this spring.
  8. barnartist

    barnartist Minister of Fire

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    I got my draft fan yesterday. Upon looking it over, it would appear I would need this thing to run at least a liitle bit continuously or else I will get smoke out of the whole where the fan shaft is. Not really what I had in mind. I will also need to better seal the area where the fan frame sits and mounts on the stack.
    I was really hoping to only run the fan when I open the door...
  9. Vtgent49

    Vtgent49 New Member

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    I'd say that a decent warm chimney will be pulling air into those openings, not leaking smoke out of them. The inducer should also be helpful when you are tring to light a new fire.

    Al
  10. sparke

    sparke Minister of Fire

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    The only time I ever had smoke come out of the shaft area was on start up. Off coarse you will have the fan on then. I put a timer and different rheostat on my fan. The factory rheostat would not allow the fan to go slow enough for proper draft. I used a fan dimmer... I run the fan for about 3 hours at start up then the timer shuts it off.
  11. barnartist

    barnartist Minister of Fire

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    Well, I installed the draft inducer. No leaks from whole I cut, but crap- I still have smoke at me when I have the loading door open! Im not sure what this means. It is raining steady here all day, so Id rather wait before I head to the roof and inspect the stack cap. No other areas that I can see have any sort of buildup. ^%$#^%$#
  12. Redox

    Redox Minister of Fire

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    I would be concerned with the pressure drop when the fan is not on. Perhaps an inline style would be a better choice?

    http://www.tjernlund.com/draftinducer.htm

    I would also be concerned with the bearings cooking when it is not running, as most of these have a small fan outside the airstream to act as a heat slinger.

    Just thinking out loud...

    Chris
  13. hkobus

    hkobus Member

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    Barnartist, h've been a bit too busy lately and have to do some catching up here. Ever-since I installed the ad-1 I have had much less smoke. The times I do get some from the front door is when a: the by-pass is only partially open, b: the bottom door is open c: very wet wood creating a lot of smoke. I have only seen smoke from the opening when a startup "puff" took place.
    I also keep an eye on the unit temps. If the unit is mounted as instructed, with the motor on the bottom, the heat will not destroy it. My exhaust temps low enough not to heat the unit during regular gasification. ( unit off)
  14. barnartist

    barnartist Minister of Fire

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    Thanks Hog. I am still trying to figure out the smoke issue. I just had to start a new fire this morning, and I got pleny of smoke back at me. I am going to have to dig harder. I hate to think about going to 8" pipe (from 6) because of cost. Seems like it should draft better as is....
  15. hkobus

    hkobus Member

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    Just a quick question BA, do you actually feel a draft with the fan on? I run a 7" pipe and I am just done filling the unit. If I leave the door wide open when there is some, it will come out the front. When I have very little smoke (getting more wood build in the chamber) the smoke will go through the by-pass. I feel there is a problem with the door opening , in the way that it is right at the ceiling of the chamber. Any "flow" will take the way of least resistance. When the door is wide open, the draft in the chimney is still good, but the air speed in the door opening will be much less due to it's larger opening. (20 "Sq v.s 175" Sq) almost 9X larger.
    When we ran a Newmac combo unit, it had a lot of space above the door, and even without a fan it had very little smoke billow out. I am thinking about making a movable "flap" inside the door, partway in the door opening. Still allowing wood in, but trapping some smoke inside and reducing the door opening.

    Henk.
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