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  1. #31
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    Quote Originally Posted by Lappa View Post
    I’d be interested in what compounds/products you were testing for.

    So you wouldn’t have a gas stove either? Just curious
    Typically it was CO, CO2, NO, NO2 and NOx. We did not test for Aldehydes which is the one that people tend to smell the most.

    Gas stoves are totally different and tend to have either Defendi or Sabaf burners (or Chinese knockoffs) which are very consistent and reliable from a combustion perspective. The combustion from these types of burners is generally stoichmetric from the factory without any adjustment.

    Coupled with a good rangehood, any ill effect is mitigated. Typically most rangehoods that I have had approved over the last 25+ years have been ducted (ie 10,000's). To be honest I cannot recall being involved with any recirculating rangehoods.

    Back in the 1980's the NHRC (National Health and Medical Research Council) did a Melbourne wide survey in winter which we were participants of. Our own house had cleaner air inside than outside despite having gas ducted heating, an open wood fireplace (which we used extensively) and a gas hotplate.

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  3. #32
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    Jan 2014
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    Sydney Upper North Shore
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    Thanks for the reply. It’s interesting that you didnt measure for PAHs.
    Non ducted, Recirc rangehoods with charcoal filters are reasonably common - always one or two on display in appliance stores. I remember them from my earlier days in units/apartment blocks.
    Stoichiometry is interesting in that going slightly leaner will reduce CO and HC but may increase NOx, depending on how lean you go.

  4. #33
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    Latrobe Valley
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    Quote Originally Posted by Lappa View Post
    Many if these just recirc. back into the room
    Don't believe that's correct Lappa. Most above stove extraction is vented in the ceiling cavity and more recent times, if done correctly (to the BCA), is vented through the roof.

    Edit: Just queried a guru and I am mistaken. Recircs are OK much to my bewilderment.

  5. #34
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    Your guru was correct. Just an example to show they do exist

    EBC6AC5F-278F-4F36-A277-64A08CB171DB.jpgCBE53853-E5F9-407B-AFD4-D38963A0A582.jpg

  6. #35
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    McBride BC Canada
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    Plumbers can't do gas fitting without the license.
    I'd be surprised to learn that they would actually run the line into the shed and THEN cap it off.

    For $100, I would look at subsequent billing for "service access".
    Down the track, a BBQ grill and a forge, gas heat for warmth, sound very attractive to me.

  7. #36
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    Jul 2008
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    geelong
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    One of those plug in fittings might be an idea -blowtorch or heater?

  8. #37
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    An article currently in the news on open-flued heaters, and their dangers:
    Open-flue gas heaters are potentially deadly and should be phased out, coroner finds - ABC News (Australian Broadcasting Corporation)

    Surely it follows that if open-flued are dangerous, then unflued must be worse still? ALL of the carbon monoxide would be retained in the room.
    Regards, FenceFurniture

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  9. #38
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    Quote Originally Posted by FenceFurniture View Post
    An article currently in the news on open-flued heaters, and their dangers:
    Open-flue gas heaters are potentially deadly and should be phased out, coroner finds - ABC News (Australian Broadcasting Corporation)
    Surely it follows that if open-flued are dangerous, then unflued must be worse still? ALL of the carbon monoxide would be retained in the room.
    See post number 18.

  10. #39
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    Hmm - so cosy and toasty.

    11110D9F-D792-4133-A94D-14B689B2243D.jpg

  11. #40
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    I have several vent stacks to the sky and the filters can be cleaned with a couple of cycles in the dishwasher.
    I've seen the recircs and they are a right booger to open and clean up. To be honest, I'd rather repair what I have.

    Our gas and oil fires are vented/chimney to outdoors. Same with my pellet stove.
    There's no connection whatsoever to the air being heated, coming through the heat exchanger, fan driven.
    My fresh air intake pulls whatever, even -35C.

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