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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