In door/window parlance, this configuration is referred to as an OXO.
The O’s stand for a non-operable door or window sash or opening. The X stands for an operable door or window panel or sash.
You’ll notice that on many, if not most of these wood door & window assemblies that we replace, that there is a pattern emerging as it relates to why the original assemblies had to be replaced. In my opinion, that pattern is a lack of overhang. A lack of significant eves or an awning or something.
In my humble opinion…this is something architects should take to heart for structures subjected to climates such as in the Willamette Valley when specifying “wood” windows and/or doors. Clad…or not.
But then, that would take a significant bite out of our business. So never mind.