Revisions log for Answer #1249

Up to 120 cm is certainly not the maximum size, but it's already a lot for a single sheet. Practical sizes are 87.5 / 100 / 112.5 cm – and 112.5 is highly recommended. It is still easy to handle, and you can walk across it with a tray without fear of hitting your elbows.

The height in the envelope dimension assumes that this includes not only the bottom overlap of the floor structure, but also the roller shutter box. Without the latter, a height greater than 240 cm would be a special size for many manufacturers with significant additional costs. In this regard, I assume a sash height of no more than 220 cm.

Windows, by the way, are windows by trade. They are made for it, learned to do it, and can stand it – being open and closed is part of it. The hardware and hinges take into account that you can make French windows in different sizes, too. The hinges tilt open no farther than on windows from window sill height, in degrees relative to height even less.