Casment Window System

A casement is a window that is attached to its frame by one or more hinges at the side.They are used singlyor in pairs within a common frame, in which case they are hinged on the outside.Casement windows are often held open using a casement stay.Windows hinged at the top are referred to as awning windows, and ones hinged at the bottom are called hoppers.

The hinging of casement windows is referred to using the following abbreviations FCL refers to a left-handed window, where the hinges are located on the left and the locking mechanism is on the right.
FCR is a right-handed window with the hinges on the right and the locking mechanism on the left.These definitions apply to a window when looking at it from the exterior. In some countries architectural diagrams of casement windows show a dashed triangle with the hinged side identified by the point of the trianglewhile in others they point to the lever, showing a simplified perspective of the opened window (e.g. Hungary, Germany).Furthermore in some countries (e.g. Hungary, Germany) diagrams also make distinction between windows opening inwards (dashed line)or outwards (solid line). FCL windows feature a triangle pointing to the left; FCR windows have a triangle pointing to the right. Casement windows design also allow for ease of cleaning energy efficiency