Enviro Mini - Sorry - But Yet Another OAK (Outside Air Kit) Question

LI-Mini-Owner Posted By LI-Mini-Owner, Feb 14, 2010 at 7:39 PM

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  1. DexterDay

    DexterDay
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    I have an OAK on mine. I did a pretty good job sealing all holes, and cracks in my system.

    Even if you don't, the air will take the path of least resistance. It would rather come in that 3" vent that's a few inches away from the intake source, than come in through your bedroom window 35' away. IMO.

    OAK's always help....
     
  2. Don2222

    Don2222
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    Feb 1, 2010
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    Most OAKs take cold and sometimes damp air from the outside which unfortunately reduce the overall efficiency of the pellet heater. It's like putting damp and cold wood into a wood stove!

    The absolute best solution is to pre-heat that outside air to make it warm and keep it dry with Selkirk DT venting that I install.

    see pic below
     

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  3. LI-Mini-Owner

    LI-Mini-Owner
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    Nov 22, 2007
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    I replaced my vent/thimble this year because I had the house re-sided. I installed a Simpson Duravent thimble with a build in OAK. Even though it doesn't terminate at the burn pot, at least I know the stove isn't competing for air.
     
  4. Enviro Mini Owner

    Enviro Mini Owner
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    Jan 2, 2013
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    I went ahead and had an OAK installed. Even though it is not a perfect connection as detailed above, it has allowed me to leave the forced air vents from the gas furnace open that were the stoves source for air, dragging the cold basement air up into the house. Everyone of them, we live in a small cottage, was a torrent of air.
     
  5. DBCOOPER

    DBCOOPER
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    Jan 23, 2010
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    Are you saying that preheating the air drys it? Where does the moisture go?
     
  6. jhanan

    jhanan
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    Sep 29, 2012
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    Thanks, this answer some of my questions about the OAK connection on the Mini I'm installing right now. I also though it was missing parts to the burn box. Now, what about the large air intake hole between the draft slider and the combustion fan. That is strange design to me as well. I guess the design mixes house air with exhaust air on right before the combustion fan. I guess the design is like the air max flapper on my furnace exhaust ducting.
     
  7. jhanan

    jhanan
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    Sep 29, 2012
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    Also it looks like my stove arrived with the "with the little flapping door" missing!!! Will have call dealer on Monday. Is the door optional. Thinking about making a temporary solution. The door is to the fan box where that vacuum sensor hose terminates.
     
  8. jhanan

    jhanan
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    Sep 29, 2012
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  9. bob bare

    bob bare
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    Oct 31, 2013
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    Before you jump on the"fake OAK" bandwagon,Realize a lot of european stoves were/are made this way,some american stoves have bleed holes(shudder everytime someone writes they taped/blocked them).Cold air reduces availible heat,hence the design of your stoves pipe system,same as a bixby.There also may be safety reasons for these designs,as something bad could happen with total air blockage.
     
  10. hockeypuck

    hockeypuck
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    Sep 6, 2009
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    I would be afraid of voiding any warranties by doing this. The enviro, like many other stoves, do not direct the outside air into the air intake port. Why they want to mix inside air is anyone's guess. Could be safety reasons... ie the oak gets blocked or it also could be they want to blend the cold air with warmer air before combustion. "Gerryrigging" your own thoughts on what an OAK should be could be dangerous. This is one of the reasons why I do not feel the urge to install the OAK. Until I figure a way to install some sort of automatic damper to open and close the air supply, I will not be using one. My stove does not run 24/7, so why would I want cold air pouring into my room. I have enough leaking window that already does this.. I do not need any more drafts.
     
  11. bob bare

    bob bare
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    Oct 31, 2013
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    Good to see some common sense.Appears some people did not pay attention in school.One reason for a blended system is in case of house depressurization,smoke does not get drawn into house as bad.Do not have an oak as I shut stove off during day a lot,and run it on low a lot,however adding a water valve to a oak would be easy.European stove installers sell oak sets with a simple shutoff made in pipe,if you are interested. http://www.woodheat.org/the-outdoor-air-myth-exposed.html
     
  12. jhanan

    jhanan
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    Sep 29, 2012
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    The design does not make sense. My US Stove OAK is a direct connect to the outside so there is no cold air dumping into the room.
     
  13. jhanan

    jhanan
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    Sep 29, 2012
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    Pellet stove is a forced air system - so does this apply? Anyway - a value would be must and you have to now remember to turn it on and off.
     
  14. bob bare

    bob bare
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    Oct 31, 2013
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    What part not apply?Also,most of the rest of the world does not waste heat the way we do,so walking over and shutting a valve is nothing to them.(heat costs lots more for them)
     
  15. batchman

    batchman
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    Oct 29, 2013
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    On my Maxx, I found I was getting very little draft through the OA pipe. I removed the backdraft flapper and it improved enough to at least hold a piece of paper over the open end of the pipe - but not even dimple it. I'm starting to think about a vacuum controlled flapper valve in the OAK.

    I think too much.

    Cheers,
    - Jeff
     
  16. bob bare

    bob bare
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    Actually good idea.
     
  17. bob bare

    bob bare
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    We can agree to disagree.But why do some stoves that oak is directed to firebox have holes drilled and a stopper flange so they cannot be covered?I think engineers know more than us.
     
  18. bob bare

    bob bare
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    Oct 31, 2013
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    Thanks for reply.I see you,me and don agree preheated air is better for combustion,especially in colder weather.As my unit is old,that would make sense,and I have heard enviros had wind problems,so that was their fix.You do know you are going to make some people mad with that "running in cold climate" statement!!!! By the way,montana is generally way warmer than the upper mid west(michigan,etc) just cooler weather lasts longer out here.Lots of days stove only runs a few hours.
     
  19. bob bare

    bob bare
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    Oct 31, 2013
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    What I meant was there are a lot of oak people that think it makes all stoves run better,all weather,all oak configurations.But in the last 2 weeks it has been anywhere from -30 to 50,but I am in the mountains,6500',most people live in the valleys.
     
  20. bob bare

    bob bare
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    Do some research,i run an austroflamm,has a mass air flow sensor(bmw)was specifically designed to run at all altutides.Some of the Italian stoves use this system now,so suppose they would work.Have worked on other stoves at higher altitudes,usually have to bypass vacuum sensor(older ones) but if had pressure sensor was ok(some whitfields.etc)Best to have short exhaust when going higher in mountains.This is just my experiences,auto mechanic by trade.Best way to approach problem(altutide)is speed up combustion blower.Need more volume for same o2 content.
     
  21. bob bare

    bob bare
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    Oct 31, 2013
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    I agree.The older st croix multi fuel manual control stoves do well up high,do not know about corn.If you have rich customers,take a look at rikas pellet and wood combo stove.
     
  22. jhanan

    jhanan
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    Sep 29, 2012
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    Why remove the backdraft flapper? If it removed, then the combustion fan will draw all the air through the backdraft hole instead of through the burn chamber.
     
  23. batchman

    batchman
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    Oct 29, 2013
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    Well I don't know where that piece is on the subject stove, but on mine it is in the OAK inlet. I found that running on pretty high setting I was not drawing enough air through the pipe I've attached to matter. I pulled the pipe off and could see the flap moving ever so slightly - not much draft happening there. So I made sure it wasn't bound up, then pulled it. Now my OAK pipe can at least hold a piece of paper in place - before not even that.

    Cheers,
    - Jeff
     
  24. jhanan

    jhanan
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    Sep 29, 2012
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    Ahhh, OK, so your OAK has a damper. Ya, you got have that probably wide open for sure.
     
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