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Thread: How to keep round duct flat on top - eccentric taper

  1. #1
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    How to keep round duct flat on top - eccentric taper

    What is the best practice to keep round duct flat to the top so to speak.

    with rectangle duct I just align the 2 ducts then drag the other to it and it gives me and eccentric transition, but with round I can only align to the center line..

    N

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    Quote Originally Posted by nick_h View Post
    What is the best practice to keep round duct flat to the top so to speak.

    with rectangle duct I just align the 2 ducts then drag the other to it and it gives me and eccentric transition, but with round I can only align to the center line..

    N
    When you're aligning your round ducts, press tab to select the outer edge of the duct, then align and reattach the duct.

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    Member MrBIMtastic's Avatar
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    When drawing the duct, set the Vertical Justification to "Top"
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    STILL! Having problems with eccentric tapers they are becoming a pain in the A** why cant they just stay flat on botton or top, and equal to each side

    **im Moddling the duct coming off a AHU reducing in size, setting the just' to centrel and bottom and its coming off equall even though its eccentric taper

    Headbanging!
    Last edited by nick_h; November 7th, 2013 at 10:52 AM.

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    Member MrBIMtastic's Avatar
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    When I'm working to tight constraints (like coming off an AHU) I'll draw the duct coming off the connection out maybe 10'. Then change size and draw another 10'. Now I can select the reducing fitting and drag/nudge it back till it's the minimum distance from the AHU connection (if that's the desired config.) If things still aren't behaving, Align and Trim are your friend. Align the center lines in plan (just to be sure.) Now align the bottom (or top) in a section. Tab while hovering over the edge to select that elusive bottom surface. Now Trim. Once it's aligned in two planes, I've never had it not connect. Just make sure your ducts are long enough to be eaten up by the fitting. You can move the fitting after.

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    cheers for that, it helps..

    another question, how do you put a offsett taper in so that i dont have to use 2 bends and straigh piece to drop 200mm or so (my engineers just moaned saying they wouldn't do that on site etc.. ) (ive just drawn the second one in to show what i need)



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    Last edited by nick_h; November 7th, 2013 at 02:35 PM.

  7. #7
    Member MrBIMtastic's Avatar
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    I'm not sure about that one. I'm not sure there is even a fitting type that can accommodate that in Revit. I'll take a look though. Anyone else have ideas about that?

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    Quote Originally Posted by MrBIMtastic View Post
    I'm not sure about that one. I'm not sure there is even a fitting type that can accommodate that in Revit. I'll take a look though. Anyone else have ideas about that?
    Think its just an eccentric taper, ive seen it drawn by mistake but how you get one when needed, i dont know

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    There is a revit duct fitting category called Offset that works exactly like your second drawing. Unlike a union or transition, that have one duct centre line and are controlled by the Justification, The offset category can have two duct centrelines for the in and out connections. So the vertical and horizontal offset between the two connectors can be set to whatever you like and it reliably stays that way. You can use them to make eccentric transitions with flat top/bottom too using a bit of trigonometry. Try using an OOTB "Offset" duct fitting or family template to make what you want. The only disadvantage of the offset category is you cant use it in the routing preferences, so its something you need to place manually each time.

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