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Thread: Eccentric Elbow

  1. #1
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    Eccentric Elbow

    I'm trying to create something like the OOTB "Rectangular Elbow Eccentric Radius - DTL" family but with straight lines instead of curves. I can't seem to edit the swept blend to that shape.

    Eccentric Elbow-eccentric-elbow.png

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    Forum Addict tzframpton's Avatar
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    I know this doesn't answer your direct question, however I'm curious as to why you are trying to develop such a fitting to begin with? To the best of my knowledge, there is no fitting that exists like this. Granted, a field sheet metal tradesman could whip something like this up with some flat metal pieces, some good math and a good pair of snips but this would also be very restrictive in air flow.

    -TZ

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    I've been wondering the same thing, Tanner. I've seen a 2D symbol used to indicate a fitting like this many times in the past and I'm working from design drawings to model existing conditions and the symbol is used many times in the drawings. I'm going to look into this and try to find out what type of fitting actually gets installed when this kind of transition elbow is indicated on the plans.

    What are your thoughts?

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    Forum Addict tzframpton's Avatar
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    I'm interested to see a screenshot of the design drawings you're working from to make sense of it. One obvious indicator is working in a 2D environment can produce geometrical impossibilities with how something was drawn, so I'm curious to get the reference you're working from.

    -TZ

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    Here it is, TZ. I've done some custom fittings in Revit but none of them come out looking like anything close to this in plan view.

    Eccentric Elbow-elbow-transition.png

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    Forum Addict tzframpton's Avatar
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    Quote Originally Posted by RobDraw View Post
    Here it is, TZ. I've done some custom fittings in Revit but none of them come out looking like anything close to this in plan view.
    That's exactly the image I had in my mind. That's just not right at all and is lazy drafting. Again, it's not that it's logically impossible, it's just that it's not a realistic elbow that would actually be used in a real world application.

    My approach would be to simply use a reducing elbow.

    -TZ

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    I found some fittings that might fit the bad graphical representation and made this (shown in wireframe).

    Eccentric Elbow-fitting.png

  8. #8
    Forum Addict tzframpton's Avatar
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    Looking at that makes me cringe, ha.

    I guess that works if all you're doing is recreating verbatim the plan view of the original document.

    -TZ

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    I hear that but for now, that is all I have to work with. I think they are called a plenum elbow or something like that and some of the examples that I saw were even more extreme than that one. It's actually not that different from some linear slot diffusers that I've seen. They are existing to remain and fit in the tight spaces so I might be pretty close to what was installed.
    tzframpton likes this.

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