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Thread: Lindab LORU formula

  1. #1
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    Question Lindab LORU formula

    Hello RVT Forum

    I have a question about these formula in Revit.
    I'm using Lindab's dataset and I'm currently drawing a LORU. I have to manually change the length of the LORU from 200mm to 450mm or 600mm depending on the duct size it is connected to.
    How can I create a formula which can change the length automatic?

    Duct size: 100 - 350 , then LORU length: 200mm.
    Duct size: 351 - 750 , then LORU length: 450mm.
    Duct size: 751 - , then LORU length: 600mm.

    Thank you.
    Christian

  2. #2
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    This should do the trick:

    if(Duct Size<350,200,if(Duct Size<750,450,600))

    Put this formula in the formula column of your LORU length parameter.

    EDIT: Make sure that your LORU length and duct size parameters are set to 'Instance'.
    Last edited by LukeEvans; January 8th, 2016 at 12:53 AM.

  3. #3
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    Hi LukeEvans

    Thank you for your respond.
    I tried your formula but it didnt work. Instead of "duct size" I have two paremeters: Lenght and Width.
    When one of lenght or width is greater than 350, the LORU lenght is 450mm.

    I have to merge these two parameters in the formula. Is it possible?

    Thank you,
    Christian
    Last edited by ChristianVE1991; January 8th, 2016 at 04:40 AM.

  4. #4
    Member evan.dodds's Avatar
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    LORU = if(or(Width>750,Length>750),600,if(or(Width>350,Le ngth>350),450,200))

  5. #5
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    Thank you! It worked.

  6. #6
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    I've never used the 'or' operator in Revit, although I can think of a few situations (such as this one) that I could use it. Cheers Evan!

  7. #7
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    If you find any other situations, feel free to share ;-).
    It is my first formula I'm working on and it is a very interesting part of Revit. Just like Dynamo is.

    Kind regards
    Christian

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