A very useful Revit family object when you would like to place blinds onto coupled openings. You can use it in 2012 or later. Fully parametric, but some features depend on manufacturing process. If you get exclamation mark in your model or an alert message on plan views please check available size parameters on a plan view or at manufacturer site! Of course there are single types too. :)
If you need more difficult, tricky one, post your request on freelancer.com only for me! We'll agree...