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| Glossary of terms compiled by Western Window. |
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| Argon-filled- A glass option
that improves the energy efficiency of the window by
filling the air space inside the glass unit with argon
gas. |
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| Bay Window- A combination of
three windows, generally a large center lite and two
flankers returning to the wall at a 30 or 45 degree
angle. |
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| Bow Window- A combination of
three or more windows joined together in a rounded or
bow formation, with all sections being equal width. |
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| Brickmould- Casing around the
exterior of the window to give the window a richer appearance. |
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| CFM- Cubic feet per minute.
A unit of measure for the leakage of air through a closed
window. |
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| Condensation- Moisture on the
interior of the window caused by a high level of moisture
inside the home. Common in the winter when humidity
levels exceed 35% inside the home. |
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| Double glazing- Two panes of
glass affixed in an insulated glass unit to increase
energy efficiency. |
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| Fixed Window- A non-operable
window. Also, called picture window or transom. |
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| Glazing bead- A vinyl extrusion
that covers the seal of the glass unit. |
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| Grid- Decorative dividers inside
the insulated glass unit. |
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| Head- The top of the window
frame. |
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| Insulating glass- The combination
of two lites of glass with a sealed air space. |
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J-Channel- A vinyl accessory
part that snaps onto the outside perimeter of the window
frame for inserting siding, typically vinyl siding,
for finishing purposes. |
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| Jamb- The sides of the window
frame. |
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| Lift rail- Located on the sash,
the lift rail has a pull by which the sash is operated. |
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| Low E glass- Low-emissivity
glass has a metallic coating applied to the glass that
resists the transfer of heat. |
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| Mullion- The vertical or horizontal
joints between windows joined together. |
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| Net size- Actual width and height
of the window, ½" less than the rough opening
size. |
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| R-Value- A measure of how much
a material resists heat transfer. Inverse of U-Value. |
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| Rail- The top and bottom or
horizontal parts of a sash. |
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| Rough opening- The framed opening
in a wall to receive a new window. |
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| Sash- The operable section of
a window. |
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| Sash balance- The hardware in
a single hung window that holds the sash in place in
the opened position. |
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| Sill- The bottom of the window
frame. |
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| Single Hung- Operable window
with the sash opening vertically from the bottom |
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| Slider- Operable window with
the vent opening horizontally from side to side. |
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| Solar heat gain- The process
of measuring the net heat gain through windows and other
glazed areas, inside the home. |
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| Stile- The sides or vertical
parts of a sash. |
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| Transom- A small window above
another window or door. |
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| U-Value- A measure of how much
energy a material conducts. The lower the U-value, the
better the insulating effect. |
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| Vent- The operable portion of
a window. Also, called sash. |
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