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colinear venting kit for mendota

Post in 'It's a Gas!' started by keith, Jan 6, 2011.

  1. keith

    keith New Member

    Joined:
    Jan 17, 2006
    Messages:
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    Can anyone clearly explain where and how fresh air can make it into my mendota d40 gas insert hearth without
    mixing with the exhaust. On top of the colinear vent converter box are two separate
    ports, one that exhausts and one port that takes in fresh air. However on the bottom of the converter
    is only one outlet. What am I missing? Is it simple physics where the upward hot draft forces the
    exhaust out and the colder air has to come in and does not allow the hot exhaust that other exit option??

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  2. jtp10181

    jtp10181 Minister of Fire

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    You sure you dont have a B-vent insert cap?

    Would need a pic, not a mendota dealer. Our liner kits have an exhaust and intake connection on the bottom of the cap and the fireplace. We run a 2 full length 3" alum liners.
  3. trafick

    trafick Member

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    Loc:
    Lynchburg, VA
    Also there is a conveter that takes what looks like a single port and turns it into two. The outlet on my stove has one port that is actually two, one inside the other. There is then the converter that goes to two pipes up the chimney and then another converter at the top of the chimney that takes two pipes and converts back to one. Clear as mud?
  4. DAKSY

    DAKSY Patriot Guard Staff Member

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    Loc:
    Averill Park, NY, on Burden Lake II...
    Sounds like you might have a co-linear to co-axial adapter.
    They're used to go from co-axial DV stoves to the co-linear 3" vent kits...
    Your adapter generally isn't used for inserts.
  5. ruth140

    ruth140 Member

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    Loc:
    660 East Bay Ave Manahawkin n.j. 08050
  6. ruth140

    ruth140 Member

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    i will get you the answer.... the air can actually go in the wrong vent at times and reverse into the outtake.
    i am not a technician but i have a few. :)
    also you have to have the one vent shorter then the other or the exhaust can actually go into the intake, if conditions are right.
    i'll get back to you on your question:)
  7. ruth140

    ruth140 Member

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    660 East Bay Ave Manahawkin n.j. 08050
    but the simple answer is ...yes, its simple physics......hot air rises :)
  8. ruth140

    ruth140 Member

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    660 East Bay Ave Manahawkin n.j. 08050
    do you have a co-axle or co-linear vent kit?
  9. ruth140

    ruth140 Member

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    Loc:
    660 East Bay Ave Manahawkin n.j. 08050
    there is 2 outlets on top of the unit,... an inner and an outer. 4 " and 6 " i believe. the inner is the exhaust and it is sealed when the pipe is connected...leaving the outer ring open....the exhaust is the inner flue .
    the outside air is let in throw the chimney cap and funnels down into the outer ring in the top of your unit.
    help any?
  10. keith

    keith New Member

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    Jan 17, 2006
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    My gas insert has one pipe coming down into the combustion chamber from under the colinear converter box.
    If there is an air inlet within this pipe or around it, what prevents the hot gasses from exhausting up it.
    Are you telling me, based on physics, hot air can't rise up into that cold air that is being drawn into
    the hearth for combustion?

    p.s. there is a white felt gasket where the pipe enters through the mendota steel/sheetmetal top...
  11. ruth140

    ruth140 Member

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    your exhaust vent pipe is sealed....gases can only exit thru it. the outside air is entering your firebox from the bottom of the unit. there is a chamber all around your fire box. the utside air enters thru the top of the unit and circulates to the bottom and into the box for combustion.
  12. keith

    keith New Member

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    Ruth, if you are right and there is a sealed air chamber surrounding the steel firebox then I may now
    have my air flow figured out. The outside air enters from the chimney into one of the inlet pipes
    on top of the colinear converter box, never mixing with the exhaust line, but entering the sealed outside
    air chamber of the mendota unit. Where can I specifically locate/see this separate air chamber point of entry
    into the sealed firebox. Last time I had the logs out and cleaned it I don't remember any openings for air and every
    corner seemed welded and the bottom sheet metal holes for thermopile/couple/pilot entry/etc.. sealed with red firecaulk????
    According to the colinear side view page 12 d40manual it appears chamber is in back but doesn't show entry point.........
  13. ruth140

    ruth140 Member

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    660 East Bay Ave Manahawkin n.j. 08050
    i can find out for your specific model as each fireplace has its own way of allowing the sir to enter. but yes you are understanding me correctly. the outside air does not ever enter the exhaust .
    what yr is the model you have of the mendota d40 dv?
  14. ruth140

    ruth140 Member

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    Loc:
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    hi! i hope you are understanding how a direct vent fireplace works!
    they are all very similar in that they use outside air for combustion. therefore they are all double walled if you will.
    in your unit the air enters through 2 different air shutters. one is adjustable ( but do not adjust it) it was set by the installer .
    the other in is the burner tube and not adjustable.
    each unit is different in how the sir is allowed in the fire box.
    the reason for the air shutter that is adjustable is because these units can be converted from lp propane gas to natural gas...each fuel type requires a different air mixture.
    i hope this helps you better understand how a direct vent fireplace works.
    this is why most people have a service tech clean and service their fireplaces yearly.
    if you miss place a log or some embers in these units they will not function to their optimum ability.
    enjoy your mendota...it is a high quality company , you have made an excellent purchase
  15. keith

    keith New Member

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    Jan 17, 2006
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    Purchased Mendota about five years ago. Last week was experiencing flame lift off that's why
    I inquired about air flow patterns. Today it lit up perfectly. Maybe on windy days the draft
    takes longer to be created and messes up air flow thus causing flame lift off or burner cut off.....
    Since I keep pilot off during standby, maybe I will run pilot for awhile when running before
    hitting burner switch on. I have 30ft plus high masonry chimney with high wind cap...
    Only complaint is that the optional brick liner kit and log b in timberfire set is not durable.
    Top brick liner is sagging and log b cracked easily even after they sent replacement.
    Blowers and Bentley doors are heavy duty and beautiful... Thank you....
  16. ruth140

    ruth140 Member

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    Loc:
    660 East Bay Ave Manahawkin n.j. 08050
    has the flame ever lifted off the burner before?
    wondering because you said you took your logs out.
    if there were not put back exactly right and the glowing ember placed in the correct places you can have
    all sorts of proplems.

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