Single-Hung/Double Hung
In double-hung units, both sashes slide vertically.
Only the bottom sash slides upward in a single-hung
window. Ventilation area can vary from a small crack
to an opening of one-half the total glass area. Screens
can be placed on the exterior or interior of the window
unit.
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Casement
Casement windows are hinged at the sides. Hinged windows
such as casements 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.
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Awning
Awning windows are hinged at the top and open outward.
Hinged windows such as awnings 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.
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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 building wall and is made up of one or more windows.
All the units can be stationary, operating, or any combination
thereof.
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Bow Window
A series of four or more adjoining window units, commonly
five in number, installed on a radius from the wall
of the building.
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Fixed Frame
Refers to windows that are non-venting or inoperable.
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Skylight
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.
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Slider
Both sashes slide horizontally in a double-sliding window.
Only one sash slides in a single-sliding window. Ventilation
area can vary from a small crack to an opening of one-half
the total glass area. Screens can be placed on the exterior
or interior of the window unit.
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