Awning
Awning windows are hinged at the top and open outward. These generally have lower air leakage rates than sliding windows from the same manufacturer because the sash closes by pressing against the frame. Screens are placed on the interior of the window unit.
Bay Window
A bay window is made up of three or more windows. The side or flanker units project out from the building in 30, 45 or 90-degree angles. The center is parallel with the building wall and is made up of one or more windows. All the units can be stationary, operating, or any combination thereof.
Bow Window
A bow window is a series of four or more adjoining window units, commonly five in number, installed on a radius from the wall of the building.
Casement
Casement windows are hinged at the sides. These type of windows generally have lower air leakage rates than sliding windows from the same manufacturer because the sash closes by pressing against the frame. Casement windows project outward, providing significantly better ventilation than sliders of equal size. Because the sash protrudes from the plane of the wall, it can be controlled to catch passing breezes, but screens must be placed on the interior side.
Fixed Frame
Fixed frames refer to windows that are non-venting or inoperable.
Single Hung/Double Hung
In double-hung units, both sashes slide vertically. Only the bottom sash slides upward in a single-hung window. The ventilation area can vary from a small crack to an opening one-half the total glass area. Screens can be placed on the exterior or interior of the window unit.
Skylight
A skylight is a window installed in a roof and assuming the same slope. Depending on which direction they face, skylights can bring in more light and heat than windows. For example, in the summer months, an unshaded, south-facing skylight will bring in more direct sunlight and heat than a window. In a cold climate, a north-facing skylight gives almost five times more light than a north-facing window, with almost the same amount of heat loss.
Slider
Both sashes slide horizontally in a double-sliding window. Only one sash slides in a single-sliding window. The ventilation area can vary from a small crack to an opening one-half the total glass area. Screens can be placed on the exterior or interior of the window unit.
