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  1. #16
    Join Date
    Feb 2006
    Location
    Perth
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    27,756

    Default

    I was in at Bunnings today looking at their plastic pot offerings in hope of finding a basic 9" to 6" ducting transition when I stumbled across these types of pots.

    This one was not wide enough at the mouth for my transition but it would make a reasonable BMH.


    Pros
    Good basic shape, made of strong plastic - I think its HDPE.
    Unlike many pots the holes are only on the bottom, Most pots have gaps up the sides as well (whereby they would leak air)
    The base suits a 6"/150mm duct (I'll show you how further down) and the opening has a nice wide radiused edge.

    Cons
    They are longer than the optimised 6"/150 mm BMH so will take up more space - but that might be OK for a lathe or Belt sander situation and maybe even for some cabinet ports
    They are wider than the optimised 6"/150 mm BMH so would not project higher air intake speeds as far as the optimised hood.
    The radius of curvature is not quite right

    But Hey - for $6 they have to be better than a naked piece of duct.

    Playpot.jpg

    Here's how I would convert these.
    These photos are of the 6 = 9" transition I am making has the same size 6" base as the above pot, but this one has an opening that is a little wider than the above pot

    Cut the bottom out with tin snips or a strong pair of scissors. Leave a couple of mm of lip for a longer/tighter contact with the 6"/150 mm ducting.
    These pots have 4 little ribs on the inside corner and these need to be completely cut away with a utility knife.

    Put the pot on top of a piece of PVC ducting and while rotating the pot, heat up the outside edge of the pot base with a hot air gum until the plastic develops a sheen.
    Don't let it get too hot or it will melt and ruin the edge.
    To get a feel fr how hot practice on the scrap you cut out from the base.


    Plantpot2.jpg

    Then, push and stretch the edge of the pot base over the PVC duct - considerable force is required.
    push the pot right down to the end of the pipe.
    You could radius the inside edge of the duct for an improved flow and can seal any small gaps with something like silicone.
    When it cools it grips the PVC ducting like a shrink fit tube.
    It took me about 5 minutes to make.

    For my transition the 9" (250 mm OD) duct slides neatly up to the first ridge line inside this pot so it should be OK as a reducer.

    Plantpot3.jpg

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  3. #17
    Join Date
    Oct 2013
    Location
    Perth, Australia
    Posts
    1,813

    Default Bell mouth hood offer - expressions of interest

    Have you ever had trouble fitting flex ducting over your hoods? I bought 3m of 150mm ducting from Timbecon a few weeks back and couldn't for the life of me get it over the pvc hood. Didn't think to measure it before I bought the ducting, only realised after that the pvc pipe is slightly larger than 150mm. Hoping I can use it, stuff ain't cheap!

  4. #18
    Join Date
    Feb 2006
    Location
    Perth
    Posts
    27,756

    Default

    Quote Originally Posted by bueller View Post
    Have you ever had trouble fitting flex ducting over your hoods? I bought 3m of 150mm ducting from Timbecon a few weeks back and couldn't for the life of me get it over the pvc hood. Didn't think to measure it before I bought the ducting, only realised after that the pvc pipe is slightly larger than 150mm. Hoping I can use it, stuff ain't cheap!

    You won't get it over - you need to use a coupler like this.
    Improving machine cabinet dust ports
    This is a much better way anyway because it does not reduce the size of the duct.
    Or buy some expensive flexy from over east.

  5. #19
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    Oct 2013
    Location
    Perth, Australia
    Posts
    1,813

  6. #20
    Join Date
    Feb 2006
    Location
    Perth
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    Default

    Yep - you will need to turn a hole in the end cap - come round and do it on the lathe if you like.

  7. #21
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    Oct 2013
    Location
    Perth, Australia
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    Default

    Gotcha, cheers mate!

  8. #22
    Join Date
    May 2014
    Location
    Canberra
    Posts
    237

    Default

    That's the Bunnings pot I bought for my 6" to 8" inlet reducer. If that doesn't work at least there is another use for it (other than as a plant holder)

    Jane

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