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  1. #16
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    Feb 2016
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    Default

    There are always plenty of second hand "Buffalo" style gas heaters on Gumtree.

    These have a monster 12 inch fan in them. I know this as there is one here. I hate it. Its grossly inefficient. I was under the house just 3 weeks ago re-taping all the joins.

    Perhaps one of these fans ripped from an old unit? They are supposed to be variable speed (ours has an ancient controller).

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  3. #17
    Join Date
    Feb 2016
    Location
    Canberra
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    2,367

    Default metre readings and Dr. Wood Dust

    I could imagine those air vents at commercial sites must be a new form of unholy hell. I shudder to think.

    ..

    On trying to get to a practical outcome, I thought to read a bit about what Bill Pentz and Matt Wandel say about such things. I found this article to be illuminating in many ways https://woodgears.ca/dust/dylos.html

    Especially about the needle felt filters and the use of various low-tech solutions (I remember BobL saying, a long time ago in a post on dust collectors and PF's, how efficient they really are, despite their apparent nastiness).

    Worth the time to read it, including the final thoughts and conclusions at the bottom....

    I really need to buy one of those 2.5ppm particle detectors. https://www.ebay.com.au/itm/Household-PM2-5-Detector-Module-Air-Quality-Dust-Sensor-Tester-LCD-Display-2-8/192876810276



  4. #18
    Join Date
    Feb 2006
    Location
    Perth
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    22,692

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    Quote Originally Posted by woodPixel View Post
    I could imagine those air vents at commercial sites must be a new form of unholy hell. I shudder to think.
    Doesn't even have to be commercial. Even in domestic situations centrally ducted AC has its problems with some bugs growing inside return ducting. Apparently human breath contains lots of ammonia and under certain conditions it plus other dust like skin cells condense inside AC return ducts where all manner of bugs feed and multiply on it. That's not usually the reason for using filters on the +ve pressure side of ducted AC but there would probably be more health issues if there were no filter. This is more of a problem in moist climates or where water leaks into an AC system. Legionella can also be spread via larger ducted AC systems.

    Especially about the needle felt filters and the use of various low-tech solutions (I remember BobL saying, a long time ago in a post on dust collectors and PF's, how efficient they really are, despite their apparent nastiness).
    Not sure what your are referring thin that last bit.

  5. #19
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    Feb 2016
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    Canberra
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    Quote Originally Posted by BobL View Post
    Not sure what your are referring thin that last bit.
    Youve written a few excellent articles that need to be pinned.

    This is one: How long does it take to "condition" a DC needle felt filter .... its from 2013!

    and there is another, which immediately comes to mind, that discussed several tests you did for colleagues on-site with their setups and leaks.... let me see if I can find that one.

  6. #20
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    Feb 2006
    Location
    Perth
    Posts
    22,692

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    Quote Originally Posted by woodPixel View Post
    Youve written a few excellent articles that need to be pinned.

    This is one: How long does it take to "condition" a DC needle felt filter .... its from 2013!

    and there is another, which immediately comes to mind, that discussed several tests you did for colleagues on-site with their setups and leaks.... let me see if I can find that one.
    OK now I know what you mean. The same conditioning principle applies to most filters except HEPAs because they have to work straight out of the box.

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