Modifying ducts fitting to fitting in Revit

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MARTHA HOLLOWELL ORCUTT: Modifying Ducts Fitting

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to Fitting in Revit.

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In this video, we're going to search for interferences

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and then modify the duct and apply Fittings

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to Fittings to reduce the depth between duct runs

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in tight spaces.

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I'm working in the small medical center in the 3D HVAC view.

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There are lots of ducts running around each other--

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supply, exhaust, and return systems.

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I wouldn't be surprised if there weren't some interferences.

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I want to focus on the ground level first,

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so I'm opening the O1 Ground Floor HVAC Plan

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and zooming in a bit.

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To limit the number of interferences,

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I'm going to create a crossing window

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around some of the elements that are near this section.

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Then, in the Collaborate tab, Coordinate panel,

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I'm going to expand Interference Check.

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In my Interference Check, you can

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see I just have air terminals, duct fittings, and ducts.

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I'm going to click OK.

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And the issue is an exhaust duct interfering with a return duct.

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So I want to open the section that displays this area.

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Here is the return duct and the exhaust duct interfering.

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I need to run the exhaust duct under the return duct.

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So first, I'm going to drag the duct back

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so I have room to work.

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Now, I'm going to draw a new duct that goes down

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and around the return duct.

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I tried to draw it first so there's not too much space,

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but it won't let me because there's no place

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to put in the fittings.

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So I'm going to draw it a little bit longer, over,

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up using alignments.

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And I now have a new run of duct that

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goes under the return duct.

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But there's not enough room yet.

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The easiest thing for me to do, though,

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is just to take out these extra pieces of duct

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and then select one of the fittings

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and drag that fitting so fitting touches fitting.

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There isn't quite enough room yet.

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You can see that the duct is hanging out under the ceiling.

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So I want to modify the fittings so that they are 45 degrees.

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I select the existing duct.

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And you can see that while I can change the angle,

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I can't, in this case, while it's connected.

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So I need to put in new fittings.

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So I'm just going to delete these fittings.

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And then in the Systems tab, I'm going

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to click Duct Fitting, use a Round Elbow.

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Notice the default angle is 45 degrees.

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And I'm going to place an elbow at each end of these existing

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ducts.

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They aren't at the right angle, so I'm going to click Modify,

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come back, and then I'm going to use the Rotate

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control until they're facing the right direction.

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Now that they're facing the right direction,

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I can use the controls to drag the fitting so

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the fitting touches, and it takes up much less space.

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Now I just need to clean up the extra fittings that are there.

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So I'm going to delete those two fittings out.

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And now I'm going to mirror the other two fittings.

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So I'm going to select each of these fittings,

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and then start the Mirror command.

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I'm going to do it around the midpoint of that duct.

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Now, all I have to do is expand the length

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of the duct to fit the fitting.

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And I might want to clean it up a little bit more.

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So I'm going to move this fitting over,

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dragging it over, and then the duct back in place.

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And now you can see that by connecting

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ducts fitting to fitting, you can use less space

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as you remove interferences.