This is a repost from Revit OpEd.  You can click the Trackback Link above or click on the Link below to go directly to the original post.

http://revitoped.blogspot.com/2009/09/curtain-wall-louvers-or-how-to-avoid.html

I think that Phil Read is the first person I saw reveal this technique many years ago now, probably at Autodesk University but it may have been at AUGI in a thread, I just don't remember now.

 

The essence of this tip is using a curtain wall type to define a series of mullions that pose as louvers. The special curtain wall type is then swapped out for other panels in a larger host curtain wall. The mullions are defined as new types as well, one for a louver and one for the perimeter framing if necessary. It is important to use the Empty Panel for the Default Panel parameter so that there are no panels in the louver curtain wall, just mullions. I posted a VIDEO and you can listen and watch here now if you prefer.