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Forums >> Revit Systems >> Technical Support >> Return Air systems help? Please

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Wed, Jan 6, 2010 at 1:39:27 AM | Return Air systems help? Please




Joined: Sat, Mar 31, 2007
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Hi all,

I am trying to build a return air system in Revit MEP 2010 that is completely exposed.  Therefore I need a return air terminal that is not ceiling or floor mounted.  In the system I am creating, the return air diffusers are supposed to be directly connected to the primary return ductwork, but the program does not seem to allow me to do that.  Is there a certain fitting I am supposed to use to accomplish this?  What I really want to do is host the diffuser directly to the primary duct (which it lets me do), but it doesn;t seem to recognize the primary duct as attached and part of the retrun air system that way.  If I don't  draw the primary duct manually and use generate layout, it creates much too complicated a system than what is to be built.  I am not sure if that is clear?

Any suggestions on helpful resources for creating simple return air systems? The tutorials only cover supply systems, which I have figured out.  Also, if you have any suggestions of an air terminal component that has been created with these hosting properties could you let me know? I checked revitcity, but didn't seem to find what I was looking for.




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Thu, Jan 7, 2010 at 9:08:31 PM | Return Air systems help? Please



Eddieboarder91 Avatar

Joined: Mon, Jul 16, 2007
237 Posts
4 Stars: 8 Votes

you can change one of the non-hosted suppy air diffusers to return then what you have to do is align/offset it with your duct work and then connect it using a will probablly have to have the diffuser pretty far way from your branch duct in the begining but can then move it within an 1/8" of the duct. there really arent any tutorials that explain jsut return air since the basic modeling and system creation principles are the same across the board. you might want to check seek if there is anything up there.


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Tue, Feb 9, 2010 at 5:42:41 PM | Return Air systems help? Please



Joined: Wed, Sep 30, 2009
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5 Stars: 3 Votes

Hi Brittany, Eddieboarder91 gave you good advice.  You can not directly connect a diffuser to a duct in Revit MEP.  No air will flow through.  You have to have a tap of some sort between your diffuser and duct.


Jill Bernhardt

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