Casement windows hinge at the side to capture breezes, widening for ventilation, simple cleansing, and egress

https://charlie-wiki.win/index.php/History_Of_French_Doors_With_Windows:_The_History_Of_French_Doors_With_Windows

Casement windows hinge at the side to capture breezes, widening for ventilation, easy cleansing, and egress, with compression seals that boost energy efficiency.