topic Re: Round Duct 90° Fitting Creation in Revit MEP Forum

Round Duct 90° Fitting Creation

dsonneborn — Tue, 12 Oct 2021 19:30:12 GMT

What are some good resources for learning how to create round duct families? Specifically boiler flue piping.

Attached is a screenshot of what I am going off of to build the family. It seems pretty bare as far as dimensions/information goes but this is what we have at the moment...

I've looked up some videos but everything either seems to be square duct or piping or just crazy difficult.

In lieu of creating the family, how else have you all gotten by in this situation?

Re: Round Duct 90° Fitting Creation

RobDraw — Tue, 12 Oct 2021 20:26:00 GMT

A 90 degree fitting is an elbow. I only see data for 30 and 45 degree elbows in your image.

Are talking about the hand sketch of a funky offset?

Re: Round Duct 90° Fitting Creation

dsonneborn — Tue, 12 Oct 2021 20:31:16 GMT

Sorry, I didn't highlight the fitting we are attempting to build but it is the bottom right of the left hand side table with my notes drawn on top of it. I believe that is an elbow/90° fitting, no?

Re: Round Duct 90° Fitting Creation

RobDraw — Tue, 12 Oct 2021 20:42:34 GMT

That sketch is not clear to me if you are calling it a 90 degree. elbow.

Re: Round Duct 90° Fitting Creation

dsonneborn — Tue, 12 Oct 2021 20:48:26 GMT

Here is a better drawing of the fitting I am trying to make. Throat will be a different size but that is a minor detail at this point. Hoping to figure out how I even start building something like this?

Re: Round Duct 90° Fitting Creation

RobDraw — Tue, 12 Oct 2021 21:04:39 GMT

That's called a gored elbow. I'm pretty sure Revit has a family for flat round (oval) duct that you could reverse engineer for round if there isn't one already. I think that flat round one could be made to "look" round with equal dimensions but I could be wrong.

If neither of those are to your liking, I'm sure you can find one already built. Let us know if your search is fruitless.

Re: Round Duct 90° Fitting Creation

iainsavage — Tue, 12 Oct 2021 22:16:06 GMT

In UK it would be called a segmented bend.

This link might help

https://knowledge.autodesk.com/support/revit/learn-explore/caas/CloudHelp/cloudhelp/2016/ENU/Revit-Model/files/GUID-9324759C-CFDA-41B0-88AF-1CA9590CF309-htm.html

Re: Round Duct 90° Fitting Creation

RobDraw — Tue, 12 Oct 2021 22:49:48 GMT

Gored sounds better if you consider that Halloween is just around the corner.

Re: Round Duct 90° Fitting Creation

ToanDN — Tue, 12 Oct 2021 22:50:39 GMT

Re: Round Duct 90° Fitting Creation

iainsavage — Tue, 12 Oct 2021 23:21:50 GMT

Round segmented slip-joint bend from Revit UK metric duct library and there's a flanged version as well.

Probably just a metricated version of the US Imperial version.

Re: Round Duct 90° Fitting Creation

dsonneborn — Wed, 13 Oct 2021 16:21:34 GMT

Thank you, this helped get us on the right track. We had to piece it together in a way but were able to make it work...

Below is a screenshot of what we ended up with as the final fitting. One last question though... How do I change the system classification from defaulting to "Supply Air"?

Re: Round Duct 90° Fitting Creation

RobDraw — Wed, 13 Oct 2021 16:28:30 GMT

Why are you using that type of elbow at such a small size? There just isn't enough room to get any benefit from it.

Re: Round Duct 90° Fitting Creation

dsonneborn — Wed, 13 Oct 2021 16:32:14 GMT

Not sure what you mean by this? We are using it to route our exhaust duct and this is the size of the fitting we will use in the field. The benefit to us is having the dimensions accurately modeled in Revit?

Re: Round Duct 90° Fitting Creation

RobDraw — Wed, 13 Oct 2021 16:33:56 GMT

Why not use a round elbow?

Re: Round Duct 90° Fitting Creation

iainsavage — Wed, 13 Oct 2021 19:12:16 GMT

“How do I change the system classification from defaulting to "Supply Air"?”

Select the connectors and change their classification. Usually for duct or pipe fittings you would just use the “Fitting” classification and the fitting will then adopt the system characteristics which its joined to in the project.

@RobDraw , stainless steel and aluminium flue elbows (in Europe anyway) tend to be made segmented (gored) in all sizes. Its just the way manufacturers make them. E.g.

Re: Round Duct 90° Fitting Creation

RobDraw — Wed, 13 Oct 2021 20:54:31 GMT

I keep forgetting that it's flue exhaust and not an air system. Sorry... but thanks for reminding me.