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Harman Exhaust Blower Gasket

Post in 'The Pellet Mill - Pellet and Multifuel Stoves' started by daffonce, Sep 13, 2013.

  1. daffonce

    daffonce New Member

    Joined:
    Jan 23, 2013
    Messages:
    96
    I have always found it weird that my harman xxv didn't have an exhaust blower gasket. It seems odd to me, you have to silicone the whole exhaust system that is inside your house. The nipple that attaches to the stove has a gasket. but the exhaust blower has nothing. Is it because it is considered to be under negative pressure? i mean it is a metal to metal mate, if anything isn't perfectly flat or perfectly sized you will get a leak. if the blower mounting area is under negative pressure your blower could be pulling room air through the potentially drafty exhaust blower mounting area, instead of pulling it through the combustion chamber. Anyone have any thoughts on this? Anyone ever make a gasket for their harman?

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  2. thedak

    thedak Member

    Joined:
    Oct 29, 2011
    Messages:
    119
    Loc:
    Smoke em if u got em'
    bump
  3. Lousyweather

    Lousyweather Guest

    the firebox IS under negative pressure or the stove wont feed.
    A QUALITY pipe doesn't need RTV at every joint (ICC)
    gasketing touching the shaft of the motor could adversely affect the operation of said motor
    the amount of air pulled by the shaft is negligible compared to the air pulled thru the 2-3/8"-3" intake nipple (depends on model year of stove)
    and last, but not least, modifying your unit can void the warrantee and/or UL listing.
  4. daffonce

    daffonce New Member

    Joined:
    Jan 23, 2013
    Messages:
    96
    I was thinking about the shaft, the bearings are press fit so they should be pretty tight. I was refering to the monting of the whole exhast blower to the stove itself. it is a big 4-5" diameter flange, metal to metal.

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