DC Duct design help needed

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  • dlminehart
    Veteran Member
    • Jul 2003
    • 1829
    • San Jose, CA, USA.

    #1

    DC Duct design help needed

    I've got my newly built shed on the outside of my garage, just waiting for the HF DC. First, I need to cut the hole in the wall to bring my 4" pipe through. My initial "plan" was just just put the hole up near the top of the shed, so the pipe would come into the garage close to the intersection of garage wall and it's rafters. But, now that I've been looking into exactly how the pipes will run, I'm aware that my "plan" was really more of a "hope".

    The problem arises from the entry point for the pipe being in the middle of the garage wall. With hind sight, I think I would have put the shed at the back end of the outside garage wall, where I've been stashing my garbage and recyclables outside, rather than in the middle, close to where I expect my main sawdust producers to be.

    The issue is that, by bringing the pipe through mid-wall, I immediately have to branch in a least two, and more likely three, directions. Left, toward the back of the garage, where I'll probably put planer, drill press and sanders, and right, to the front of the garage, where I'll probably have the CMS, table saw, router, and jointer. I suspect I'll also run a pipe across the ceiling to the middle of the garage (the other side of my "shop" portion of it), where I'll have a work table and expect to do some local routing, etc.

    Well, I find that I can chain two white 4" PVC branching connectors from HD to accomplish this. (The ones that have an arm sticking out at 45 degrees from the main duct.) Just need a whole lotta stubby pieces of 4" PVC S&D, plus some 90 and 45 degree elbows going left, right, front, back. And it stands about 3' high! If I put the hole in the shed/garage wall where indicated, I'll have trouble slipping my 55 gallon chip separator barrel under it! And the shed was built just big enough to accommodate the barrel and DC.

    Short of somehow dragging my new shed back about 15 feet so it's far from most of the dust producing tools in mid-garage, can anyone suggest a way to simplify the branching I'm confronting?
    - David

    “Be yourself; everyone else is already taken.” -- Oscar Wilde
  • JR
    The Full Monte
    • Feb 2004
    • 5636
    • Eugene, OR
    • BT3000

    #2
    Dave, why aren't the elbows and wyes on the inside of the shop with one 4" pipe from the barrel going through the wall?

    Maybe I'm not getting it.

    JR
    JR

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    • dlminehart
      Veteran Member
      • Jul 2003
      • 1829
      • San Jose, CA, USA.

      #3
      JR, the elbows and wyes would be inside the stop. It's just that, what with the 2 45 degree elbows (to make a more gradual 90) at bottom heading up the wall, rightward wye above it, leftware wye over that, and 2 45 elbows at top heading across the garage ceiling, I wind up with almost 3' of junctions! Just wondering whether there isn't a more compact and elegant way of doing this; i.e., a trident-shaped junction? Or, ideally, a triangular "wye" with left, right, and front branches.
      - David

      “Be yourself; everyone else is already taken.” -- Oscar Wilde

      Comment

      • JR
        The Full Monte
        • Feb 2004
        • 5636
        • Eugene, OR
        • BT3000

        #4
        I guess I'm starting to get it!

        Your shed idea is one I thought about for a long time. So far I've not convinced SWMBO if its value...

        One suggestion is to use long-reach 90-degree elbows instead of two 45's. That will save a few inches and seems to work fine in my setup.

        My HF DC came with a triangular wye, but it's 5" (I think) at the base, and 4" at each of the other two ends. After much noodling I ended up with it, as designed, right on the DC. However, I believe it's possible to run 5" pipe from the DC, through the wall, then wye from there. You'd probably need to go to a plumbing supply shop to get the material, though.

        Sorry, I don't remember seeing a 4" triangular wye.

        JR
        JR

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