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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