Migrate materials/Constructions from Legacy

Hi @chris,
A couple of doubts from Legacy to [+].
Can’t find how to define air gap for opaque constructions.
I have one such material in the my customized IDF library and it doesn’t load from the SearchMats component.
Also have in the file Blind and Shade materials that are not found in the search. As a matter of fact no window_mats are found at all.

Compared to the Legacy the [+] finds much less materials/constructions from the same list (234 vs 33 for instance in constructions).
Thanks,
-A.