According to the LBO in BaWü, the egress opening must be "at least 0.90m wide and 1.20m high in clear view". Can anyone tell me if the term "clear" means the distance to the frame (= when the window is open)? Or does it apply when the window is closed (=window panel size)?
It's what's called "aisle width/height" for the door. So when the sash opens, the top, bottom and one side of the frame is the limit, and the other side of the opened sash still takes up some space. How thick you can be to squeeze through that opening in between is what is meant. The glazing is irrelevant; the emergency window is not based on breaking the glazing, but on opening the sash.