I would say that the so-called "classic" 74 mm design is rather to be classified as "obsolete technology" or basic class. 80+ mm are more like state-of-the-art.
I would say that the so-called "classic" 74 mm design is rather to be classified as "outdated technology" or basic class. 80+ mm are more state-of-the-art.
Yep. Installation depth 82 mm and 7-chamber profiles
Soundproofing is very important. Be sure to get the binding values for that! Nowadays, everyone does insulation well. Installation would be another matter, whether the windows look acceptable.