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Air
Chambers
- Small honeycomb spaces within the sash and frame, which help
to insulate and strengthen the window.
Air
Infiltration
- The amount of air that passes between a window sash and frame.
In windows it is measured in terms of cubic feet or air per
minute, per square foot of area. The lower the number, the less
air the window lets pass through.
Argon Gas
- An odorless, colorless, tasteless, non-toxic gas, which is six
times more dense than air. It is used to replace air between the
glass panes to reduce temperature transfer.
Awning -
A top-hinged window that swings outward for ventilation.
Bay Window
- An angled combination of three windows that project out from
the wall of the home. The windows are commonly joined at 30- or
45-degree angles.
Beveled
Exterior
- An angled extension from the frame that adds an
aesthetically-pleasing dimension to the exterior of the window.
Bow Window
- An angled combination of windows in 3-, 4- or 5-lite
configurations. The windows are attached at 10-degree angles to
project a more circular, arced appearance.
Cam Lock and
Keeper
- The mechanisms which pull the sash together when placed in the
locked position.
Casement
- A window with a side-hinged sash that opens outward for
ventilation.
Condensation
Resistance Factor
- A measure of the effectiveness of a window or glazing system
to reduce the potential for condensation. The higher the
condensation resistance factor, the more efficient the window
and glazing system.
Constant Coil
Spring Balance
System
- Device for holding vertically sliding sash in any desired
position through the use of a spring or weight to counterbalance
the weight of the sash.
Dead-air Space
- The space between the panes of glass of an I.G. unit.
Double Hung
- A window that has two operable sash which slide vertically.
Double-strength Glass
- Glass with a thickness of approximately 1/8".
Egress Code
- The code that requires a minimum opening of a window for
persons to exit or firefighters to enter a building.
Extruded
Screen Frame
- Different from a Rollformed frame, this frame is pressed
through a form or die.
Fusion-welded
- The process of joining materials by melting them together with
extreme heat (over 500ºF), resulting in the materials uniting
into a one-piece unit.
Geometric
- Specially designed windows classified as either Straight line
Geometrics such as rectangles, triangles, trapezoid, octagons,
pentagons, etc., or Radius Geometrics which include Half-rounds,
Quarter-rounds, Circles, Ellipses, Eyebrows, etc.
Glass
- An inorganic transparent material composed of sand (silica),
soda (sodium bicarbonate), and lime (calcium carbonate) with
small quantities of alumina, boric or magnesia oxides. Available
Styles: clear, bronze tinted and grey tinted.
Glazing
- The process of sealing the glass to the sash.
Grids
- Decorative horizontal or vertical bars installed between the
glass panes to create the appearance of the sash being dividing
into smaller lites of glass.
Head
- The horizontal top portion of the main frame.
Hopper
- A window with a bottom-hinged sash that opens inward for
ventilation.
I.G. Unit
(Insulating Glass Unit)
- Two or more lites of glass separated by a spacer and
hermetically sealed at the glass edges.
Intercept®
Spacer System
- Spacer system using a U-channel design to reduce the number of
conduction paths.
J-channel
- Integral extension on the outside of a new construction window
that eases installation on siding applications.
Jamb
- Vertical sections of the main frame.
Krypton Gas
- An inert, odorless, colorless, tasteless, non-toxic gas which
is about 12 times denser than air. It is used to replace air
between the glass panes to reduce temperature transfer and deter
convection.
Laminated
Glass
- Specially designed glass where two panes of glass are bonded
to a durable interlayer, providing increased safety, UV
protection and noise reduction. If the window or door gets
broken the glass will adhere to the to the plastic
interlayer-preventing glass fallout in the home.
Lift Handle
- A handhold for raising and lowering the sash. Handle implies
that the handhold is not continuous across the sash.
Lift Rail
- A handhold for raising and lowering the sash. Rail implies
that the handhold is continuous across the sash.
Lite
- A unit of glass in a window.
Lock Rail
- The horizontal section of the sash where the cam lock is
attached.
Lock Stile
- The vertical section of the sash where the cam lock is
attached.
Low E (Emissivity)
Glass
- Glass with a transparent metallic oxide coating applied onto
or into a glass surface. The coating allows short-wave energy to
pass through but reflects long-wave infrared energy which
improves the U-value.
Main Frame
- The head, sill and jambs sections of a window.
Meeting Rail
- The horizontal sections of a pair of sash that meet when the
sash are closed.
Meeting Stile
- The vertical section of a pair of sash that meet when the sash
are closed.
Mesh
- Fabric made of either fiberglass or aluminum, used in the
making of screens.
Mullion
- A vertical or horizontal connecting unit between two or more
windows.
Nailing Fin
- An extrusion attached to the main frame of a window used to
secure the unit to the rough opening.
Obscure Glass
- Glass that has been made translucent instead of transparent.
Oriel
- A window with the meeting rail located off center of the
frame. Most oriels have a 60/40 configuration.
Overlapping
and Interlocking Meeting Rail
- A meeting rail which overlaps and interlocks both sash.
Patio Door
- A glass door that slides open and close on adjustable tandem
rollers. Available in 2- or 3-lite configurations with the
operable panel available in any position.
Picture Window-
A window that has no moveable sash.
R-value
- Resistance a material has to heat flow. The higher the
R-value, the greater the resistance.
Rollformed
Screen Frame - A method of fabrication in which a flat
(usually metal) material is placed on a machine where the
material is formed into shape using differently shaped rollers
and pressure.
Sash -
The part of the window which contains the glass.
Shading
Coefficient - The ratio of solar heat that is transferred
through a glazing material relative to the solar heat
transferred through 1/8" clear glass. The lower the number the
more efficient the window is at reducing solar heat gain.
Sill -
The horizontal, bottom section of the main frame.
Single Hung
- A window in which one sash slides vertically and the other
sash is fixed.
Single-strength Glass - Glass with a thickness of
approximately 3/32".
Slider
Window - A window in which the sash move horizontally.
Sliders are available in a 2- or 3-lite configuration, with the
3-lite having operable end vents.
Sloped sill
- The sill of the window that has a downward slope to the
outside. This sill has sufficient degree of slope to aid in
water runoff.
Solar Heat
Gain Coefficient - The percentage of heat gained from both
direct sunlight and absorbed heat. The smaller the number, the
greater the ability to reduce solar heat gain.
Spacer
- Material placed between two or more pieces of glass in order
to maintain a uniform width between the glass, and prevent
sealant distortion.
Tempered
Glass - Glass with a surface compression of not less than
10,000 psi, or an edge compression of not less than 9,700 psi.
When broken, the glass breaks into pebbles instead of shards.
Tilt Latch
- Mechanism that unlocks the sash and allows it to tilt in from
the main frame.
Tilt-in/lift-out Sash - A sash that can be tilted to the
interior and removed for cleaning and is manufactured by
welding.
U-value
- Amount of heat transferred through a material. The lower the
U-value, the slower the rate of heat flow and the better the
insulating quality.
UV Block
- The percent of ultraviolet rays blocked from being transmitted
through the glass. The higher the number the lower the
percentage of ultraviolet rays transmitted through the window.
Visible
Light Transmittance - The percentage of light that is
transmitted through glass in the visible light spectrum (380 to
720 nanometers). The higher the number the higher the percentage
of visible light transmitted through the window.
Weep Slots
- Slots or holes in the sill (bottom) member of the sash
frame that allows water to escape. Weep flaps add a vinyl flap
to keep insects out.
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