Casement Window Basics
Casement windows are hinged on one side, allowing them to open outward using a hand crank. This differs from a single or double hung window, which both open up and down or a horizontal slider, which opens side to side. When opened, the entire IGU (insulated glass unit) allows in afternoon sunlight and breezes for excellent lighting and ventilation. This is one reason why casements are such excellent options for basement egress windows, which require a certain opening space to allow people to exit or enter in case of an emergency.