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WINDOW GLOSSARY

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AIR INFILTRATION
The amount of air that passes through between a window sash and frame or a door panel and frame.

AIRSPACE
All high performance windows have at least two panes of glass sandwiched
together, with an airspace in between.
The size of the airspace effects the overall window performance.
A 1/2" to 3/4" space is considered optimal.

ANTI-LIFT
Vinyl inserts are added in the main frame of the slider window to prevent
the operating sash from being removed unless it is in the full open position.

ARGON
A gas and air constituent used to fill insulated units to increase thermal performance.

AWNING
A window that hinges on the jambs, locks on the sill and projects
out from the bottom when in an open position.

BALANCES
Spring loaded single hung vent support system.

BAY
A window that projects outward from the wall of a building.
Bays usually contain three windows in 30° and 45° configurations mounted with a head and seatboard.

BOW
A curved window projecting out of the face of a wall at a 10° angle.
Bow windows are usually comprised of three to six windows mounted with a head and seatboard.

BRYN MAWR II™ (brin mar)
CertainTeed's state-of-the-art replacement windows with the classic look of traditional craftsmanship.
Proprietary Thermaflect® high-performance Low "E" glazing system is standard.

BULB SEAL
A round, soft PVC weather strip used where a compression-type seal is required (casement and awning windows).

BUTYL
Polyisobutylene is a hot melt sealant used as the primary seal for dual seal systems on insulated glass units.

CAPILLARY TUBES
A very small metal tube, which is factory placed into insulated glass to
accommodate air pressure differences. Capillary tubes are not sealed after installation.

CASEMENT
A window with one or more horizontally operating swing-out sashes hinged at the jambs.

CASING
Molding of various widths used to trim window openings.

CERTAVIN™
The proprietary PVC (polyvinyl chloride) product from with CertainTeed windows are constructed.

CFM
The number of cubic feet of air leakage per minute per each lineal foot.

CONDENSATION
Beads or drops of water that accumulate on the inside of the window
when warm, moisture-laden air from the interior cools to the
point where it can no longer hold the water vapor.

CONDUCTION
Refers to heat flow through a solid material such as a window frame or glass.
In the winter, the interior surface of a window is warmed by the home's
heating system and that heat is conducted (or transferred) to the cooler outdoors.

DAYLIGHT TRANSMITTANCE
Measures the amount of visible light that is transmitted through the glass.

DEGLAZE
Removing the glass from the window frame.

DESICCANTS
Porous crystalline substances used to absorb
moisture and solvent vapors from the airspace of insulating glass units.

DEVON® (dev in)
CertainTeed's proven line of replacement windows,
installed in more than three quarters of a million American homes.

DIAGONAL DIMENSIONS
A window measurement in two places, each corner to the opposite corner.

DIVIDED LITES
In traditional window construction, the separate panes of glass
that make up the gridwork of a whole window.

DOUBLE-GLAZING
Also called double-pane or twin-pane;
window panes made up of two layers of glass with an insulating space in between.

DOUBLE-HUNG
A window with two movable up-and-down sashes for optimum ventilation.

DOUBLE-STRENGTH GLASS
Double-strength glass (1/8"). Also known as heat strengthened glass.

DUAL GLAZED UNITS
Units consisting of two lites of glass and one airspace.

EGRESS
The act of leaving an enclosed space. In the window industry the term refers
to the dimensions of the opening of a window or door (the horizontal clear distance,
vertical clear distance and the area of the opening which are established by the
United Building Council). The reason for establishing minimum egress dimensions
is to insure that a person attempting to leave the building in an emergency situation
will have room to maneuver. Also proper "egress" will allow a fireman to enter
a home while wearing emergency equipment. In 1985, the minimum egress dimensions
required by most codes are 22" horizontally, 24" vertically and 5.7 square feet in area.
Some areas of the country use different dimensions.

EMISSIVITY
A measurement of a surface’s ability to emit long wave radiation or room temperature
radiant heat. Emissivity varies from 0 (no emitted infrared) to
1 (100% emitted infrared) and is the complement of reflection for infrared opaque coatings and materials.

E-VALUE
The comparative ability of a material to absorb and reflect long-wave heat energy;
the lower the value, the better the insulating quality of the material.

FIN
The vinyl flange surrounding the perimeter frame of a vinyl window or patio door.

FIXED LITE
The non-operable portion of a door. Designated as the "0" panel in a slider diagram.

FIXED WINDOW
A window that is permanently installed without movable sashes.

FRAME
The fixed lineal of the window; it holds the sash or casement.

FRAME HEAD
The top of the frame.

FRAME JAMBS
The sides of the frame.

FRAME SILL
The horizontal member along the bottom of the frame of the window.

FUSION-WELDING
Strong, weathertight method of heat-joining the corners of sashes and frames.

GARDEN WINDOW
A specialty window that forms a glass box recessed in a wall;
contains a shelf suitable for cultivating house plants.

GEOMETRIC WINDOWS
Windows that incorporate arcs or non-standard angles t
o make them a shape other than rectangular or square.

GLIDER
A window with one or two sashes that slide sideways within a track (slider).

GRIDS (OR GRILLS)
Crosspieces applied to the interior of a window to replicate the look of muntins. See MUNTIN.

HEAD
The top portion of the window frame.

HEEL
Actual net window dimension. Most heel dimensions are 1/2" smaller than rough opening dimensions.

HEIGHT DIMENSIONS
A vertical window measurement taken in three places: left side, right side and middle.

HIGH-PERFORMANCE WINDOWS
Windows that have U-factors of .40 or lower.

INFILTRATION
Air leakage, which can escape through cracks between
the glass assembly and the window frame, resulting in heat loss.

INSULATING GLASS UNIT (IG UNIT)
More than one glass pane forming a sealed system of panes used t
o increase the thermal efficiency of a window. See DOUBLE-GLAZING.

INTEGRAL GLAZING
Insulating glass unit bonded to the sash to create a single unit and increase weather resistance.

JAMBS
The vertical sides of a window frame.

LAMINATED GLASS
Two or more lites of glass bonded together with a plastic inner layer.

LITE
A single frame of glass in a window or door.

LOW-CONDUCTANCE SPACER
A non-metallic material or system that separates the panes of glass in a double-pane window,
reducing heat transfer and making the window warmer
at the edges than traditional metal spacers; also reduces condensation.

LOW-EMISSIVITY (LOW "E")
Low-emissivity glass is coated with a microscopically thin metallic layer t
hat allows visible light to pass through, while blocking ultraviolet and infrared
solar energy and reflecting away long-wave room-side heat energy.
Different types of Low “E” coatings offer varying levels of performance for each of these tasks.

MULLION (mul yen)
A separate joining piece that connects windows in a combination window.

MUNTIN (mun tn)
In traditional "grid" wood windows, the bar that holds the separate window panes within a sash. See GRIDS.

NAIL FIN
A pre-punched fin around the window through which nails can be driven
to hold the window in the rough opening; common to new construction windows.

NAIL SLOT
The slotted hole in the nail fin through which the fastener is placed.

NEW CASTLE II™
CertainTeed's windows for new construction, designed for the West.

NEW CASTLE XT™
CertainTeed's advanced-design windows for new construction, with a true sloped sill and 7/8" glazing.

NFRC
National Fenestration Rating Council.

OBSCURE GLASS
A textured glass that provides a translucent or semi-opaque effect for enhanced privacy.

PATIO DOOR
A sliding door made of two large panes of glass set in sashes; one stationary, one operable.

PICTURE WINDOW
A window that is permanently fixed in one position to afford the least obstructed view of the outdoors.
A picture window can also be referred to as a FIXED WINDOW.

PLUMB
A vertical measurement of level, taken front to back and side to side.

PROFILE
An individual extruded member of vinyl frame or sash.

PVC
Polyvinyl Chloride.

RADIATION
This refers to the process of heat traveling via infrared or heat rays from a warm object
to a cooler object. Radiant heat loss accounts for a large percentage of the heat loss in windows.
Radiant heat gains occur when sunlight shines through a window and warms objects inside.

ROUGH OPENING
The opening in a wall section into which the window is placed.

R-VALUE
The resistance of a material to heat flow.
This common measurement is the reciprocal of the U-Value. R-Value can be compared
to U-Value by dividing 1 by the R-Value.
(Thus, an R-Value of 2 equals a U-Value of 0.5.) See U-VALUE.

SASH
The moveable framework into which glass is set.
It slides in the frame of the window in grooves provided in the frame.

SASH BALANCE
A device that counterbalances a window sash.

SEAL
Insulated glass units are sealed at the edges to prevent moisture and dirt from contaminating the interior of the unit.
The seal must be durable and usually consists of an aluminum spacer with an exterior sealant.

SETTING BLOCK
A plastic block used to support the insulated unit in the window frame.

SHADING COEFFICIENT
A ratio, which indicates the relative solar heat gain through a lite of glass or glazing system.
A lower number means more shading and less solar heat gain.

SILL
The bottom portion of the window frame.

SINGLE-HUNG
A window with one moveable up-and-down sash, and one fixed sash.

SLIDER
A window with one or two sashes that slide sideways within a track (glider).

SOLAR HEAT GAIN COEFFICIENT
The amount of direct solar radiation that enters through the glass into the home as heat.
The smaller the number, the better the glazing is at preventing solar heat gain.

SOMERTON II™
CertainTeed's value-oriented line of replacement windows, designed for the West.

SPACER
The material that separates and seals the glass in an insulated glass unit.

STILE
The vertical members of a sash.

STUCCO/FLUSH FIN
Fin option with the fin flush with the window face.
This option is used most often in replacement window applications,
with the fin serving as a frame around the window.

TEMPERED GLASS
Heat strengthened glass used for safety purposes.
Approximately four times as strong as annealed glass.

THERMAFLECT®
CertainTeed's proprietary Low "E" glazing system that incorporates two metallic layers,
as opposed to the ordinary single layer of coating on the window glass.
These layers add additional sensitivity to the glass that selects
the most beneficial wavelengths of light and heat and blocks others.

TWIN-PANE
Windows made up of two layers of glass with an insulating space in between.

U-VALUE
The rate of heat flow through a glazing system; the lower the value, the better the insulating quality.
U-Value can be compared to R-Value by dividing 1 by the R-Value.
(Thus, a U-Value of 0.5 equals an R-Value of 2) See R-Value.

UV BLOCK
Measures the amount of damaging ultraviolet light that is blocked from being transmitted through the glass.

VENT
The sliding or projecting portion of the window. Also called the sash.

VISIBLE LIGHT TRANSMISSION
Measures the amount of visible light that is transmitted through the glass.

WEATHERSTRIP
Narrow lengths of material to prevent air infiltration.

WEEP HOLES
Slots or holes in the frame sill to provide outside release of infiltrated water.

WIDTH DIMENSIONS
A horizontal measurement taken in three places, the top, middle, and bottom.


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