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Projected windows

Hinges swinging in all directions

The sashes of projected windows are fixed on hinges, and are pushed closed against beading on the inside face of the frame. Depending on the placement of the hinges, the window will either be casement, awning or hopper.

Casement Windows

The casement window is one of the most common designs and is very adaptable. These are windows that swing open on side hinges and, as such, tend to have a lower AL value (air leakage) than say slider windows. This is due to the window sash pressing against the frame on closing. When open, they tend to offer more ventilation than sliders too, thanks to their outward projection. Because of their hinging system, almost the entire area of the casement window can be open, as compared with a slider of which only half the area may be opened. Casement windows that swing inwards are based on a design of French origin, while casement windows that swing outward are of English origin. Note that out-swinging casement windows cannot be conveniently fitted with exterior storm windows or external screens.

Awning windows

Awning windows have a single sash which is hinged at the top and always swings outward. If a screen is required for an awning window in must be placed on the inside to avoid obstructing the window's functioning. Exterior storm windows can not be conveniently fitted. The entire window can be opened, and will remain open thanks either to a gearing system at the window hinge, a window stay or another awning operator system.

Hopper windows

A hopper window is like an awning window but the sash is hinged at the bottom and opens inward. The open window will remain in place thanks to a window stay or a geared hinge.

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