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

https://rapid-wiki.win/index.php/7_Simple_Tricks_To_Totally_Doing_The_Windows_And_Doors_Upvc

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