Searl Lamaster Howe Architects The windows were the old Marvin Casemaster, which I think Marvin has phased out. The windows were based on the widest standard size awning available, I think they were a little over 3 feet wide. These windows were factory mulled together. Every manufacturer has different limitations on how large a span they can accommodate with factory mulls for window pressure and other concerns, including whether they can feasibly be shipped on a truck. Other architectural and structural factors also need to be considered when sizing the window openings - what do you need to support above the windows, etc. There is not steadfast rule of how many windows can be mulled, it will depend on the design of the space. If windows cannot be mulled together at the factory because of structural or other conditions, a structural engineer needs to be consulted to size the opening, and design the support between the windows.

jenniferruth Thank you so much for explaining this! I have a much better understanding now of how these things work.

Christina Romano Belfer - Www.belfer.com - look in wall sconces