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Thread: DC duct routing question

  1. #1
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    DC duct routing question

    I'm still poking about in my garage rafters trying to get my DC ducting in. I'm at my 2nd Wye branch and I've got a question about duct routing. I'd prefer to go with the arrangement in the pic, but the reversing direction aspect of this makes me wonder if there's an inherent problem with this.
    Attachment 9382

    My alternative is to put about a 5-6' straight run before this Wye, then run about 3' to the left before putting a 90 in to bring another duct run back to the general area that the 2nd 45 degree elbow is now pointing. Right now I'd need about 5' of ducting/fittings after the 2nd 45, the other method would take about an extra 8' or so. Regardless of which method the LH branch uses, the straight part of the Wye will end in a straight ahead run about 5 ft from where I've currently stopped, then take a 90 elbow to bring it down out of my rafters. The near side of the Wye is running back to the DC intake. Both methods reverse direction but the 2nd one would do it with a longer run but maybe the transition is better? This LH branch is one that wont get primary use. My main use down-drop will be the straight ahead one and the LH for the occasions where I've got 2 machines I want to have wheeled out and hooked up to the DC at the same time. Any thoughts?
    --------------------------------------------
    Link to my ongoing ClearVue DC Install on CV's site: http://www.gallery2.clearvuecyclones...s-Mini-CV1400/

  2. #2
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    Lemme make sure I understand ... Your DC would be sucking from the top of the pic? Is that what you mean by reversing direction?

    If so, that's a pretty big no-no. I wouldn't glue that joint together, just in case you have to clear out a clog due to that direction change.

    I'd do all i could to put that wye in the other way, even if you gotta go through some acrobatics. The thought I had was puttin' that wye in a few feet sooner and run a few 45's to the distance you need so that things don't make a sharp u-turn.

    ----

    Now ...

    In case i am way off, you might be talking about the mild u-turn. The dc being in the BOTTOM of the pic instead, you're making about a 135 degree turn off the wye. If this is the situation, i think that curve could stand to be more gentle, but I don't think it'll be a huge problem, really.

    Ideally, you could use some longer 45's that would make those three turns as gradually as absolutely possible. But I doubt they'd really give you much fits. It's gonna add to your static pressure a little, but not THAT much, i doubt.
    Jason Beam
    Sacramento, CA

  3. #3
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    Quote Originally Posted by Jason Beam View Post
    ...
    In case i am way off, you might be talking about the mild u-turn. The dc being in the BOTTOM of the pic instead, you're making about a 135 degree turn off the wye.
    ...
    That's the situation - with a 135 degree turn and the suction coming from the near side of the wye. I could probably make the piece between the two 45 fittings longer to get the U-turn happening over a longer section. This was sort of a "let's see what this is gonna look like" assembly. I might be able to put a piece between 12"-24" between those 2 45's (instead of the 7" for the demo pic). Glad to hear your thinking that this isn't going to be a huge problem though.
    --------------------------------------------
    Link to my ongoing ClearVue DC Install on CV's site: http://www.gallery2.clearvuecyclones...s-Mini-CV1400/

  4. #4
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    Update

    I also posted this question on SMC, and Mr. O'Dell prodded my for a sketch, which I should have included in the first place. Very crude, not to scale, and the reversal angle looks worse than I think it really is, but here's the gist of it.

    Attachment 9403
    --------------------------------------------
    Link to my ongoing ClearVue DC Install on CV's site: http://www.gallery2.clearvuecyclones...s-Mini-CV1400/

  5. #5
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    Man - i bet looking at it from above like that really makes you wish the obstructions weren't where they are ... boy that's poop.

    I don't think you've got too much to worry about - if you CAN, try like heck to increase the radius of that turn as much as you can, even if that means ending up parallel to the trunk, snug against the wall.
    Jason Beam
    Sacramento, CA

  6. #6
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    Mr. O'Dell isn't on the net, but taught me everything I know about working with my hands. Jim.
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  7. #7
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    Quote Originally Posted by Jim O'Dell View Post
    Mr. O'Dell isn't on the net, but taught me everything I know about working with my hands. Jim.

    And I'm sure he would have told me to shuddup n' post a pic too.
    --------------------------------------------
    Link to my ongoing ClearVue DC Install on CV's site: http://www.gallery2.clearvuecyclones...s-Mini-CV1400/

  8. #8
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    Quote Originally Posted by Doug Shepard View Post
    I also posted this question on SMC, and Mr. O'Dell prodded my for a sketch, which I should have included in the first place. Very crude, not to scale, and the reversal angle looks worse than I think it really is, but here's the gist of it.

    Attachment 9403
    try a double wye instead of the single wye and get closer to your take off doug
    If in Doubt, Build it Stout!
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  9. #9
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    Quote Originally Posted by larry merlau View Post
    try a double wye instead of the single wye and get closer to your take off doug

    Hmmmm. Hadn't thought about that, but do they make PVC double Wyes? I've never noticed any but that doesn't mean they dont exist. The idea has enough merit to call the place and find out though. Thanks.

    Editted:
    Well the idea had merit but Google searching doesn't seem to indicate there is such a thing as a double Wye with 6" at all 4 openings. Was also able to find the website and catalog for the PVC that my local supplier carries (crestline.com), and they don't make it. 4" pipe double Wyes exist and 6" with 4" at 2 of the exits exist but 6x6x6x6 dont seem to be available. Must be an inherent geometry problem? Oh well - I'll be able to make do with the original plan.
    Last edited by Doug Shepard; 06-05-2007 at 01:26 AM.
    --------------------------------------------
    Link to my ongoing ClearVue DC Install on CV's site: http://www.gallery2.clearvuecyclones...s-Mini-CV1400/

  10. #10
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    Yes they do Doug

    i have one that i got from a local hardware..they ordered it form there supplier, i belivee it was charlotte plastics.. its a 6x6x6 and worked great for my application..it was 35 dollars for it!!! try another supplier.
    If in Doubt, Build it Stout!
    One hand washes the other!
    Don't put off today till tomorrow!

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