METRO Home Improvement, Inc.
16 Harris Dr.
Marietta, GA 30067

(678) 277-9434


Windows Glossary

Air latch - A latch mechanism on the interior face which retains the window in a partially open position for ventilation.

Argon gas - An odorless, colorless, tasteless, non-toxic gas which is six times denser than air. It is used to replace air between the glass planes to reduce temperature transfer.

Awning window - A top hinged window that swings outward for ventilation.

Balance system - A device for holding a vertically sliding sash in any desired position, through the use of a spring or weight to counterbalance the weight of the sash.

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.

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, arched appearance.

Cam lock and keeper - The mechanisms which pull the sash together when placed in the locked position.

Casement window - A window with a side-hinged sash that opens outward for ventilation.

Conduction - Energy transfer from one material to another by direct contact.

Convection - Heat transfer by currents that flow from a warm surface to a colder one.

Daylight Transmittance - Measures the amount of visible light that is transmitted through the glass.

Double hung window - A window that has two operable sashes which slide vertically.

Double-Strength Glass - Glass with a thickness or approximately 1/8".

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Fusion welded - Corners of the vinyl windows are heat-welded together instead of using screws or staples, for a more precise fit and no air infiltration.

Grids - The decorative patterns on a window pane locked between the panes of glass, can be colonial, diamond, or French in style.

Hopper window - Horizontal casement window that opens from the top.

I.G. Unit (Insulating Glass Unit) - Two or more lights of glass separated by a spacer and hermetically sealed at the glass edges.

Lift rail - A handhold for raising and lowering the sash. Rail implies that the handhold is continuous across the sash.

Low E (Emissive) 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.

Mesh - Fabric made of fiberglass or aluminum, used in the making of screens.

Meeting Rail - The horizontal sections of a pair of sash that meet when the sash are closed.

National Fenestration Rating Council (NFRC) - NFRC is a non-profit, public/private organization created by the window, door and skylight industry. It is comprised of manufacturers, suppliers, builders, architects and designers, specifies, code officials utilities and government agencies. NFRC has established a voluntary national energy performance rating and labeling system for fenestration products. For more information visit their web site at www.nfrc.org. >>>

Oriel - A window with a meeting rail located off center of the frame. Most have a 60/40 configuration.

Picture window - A window that has no moveable sash.

Pivot System - A hinged type system used on hung windows. This system attaches the sash to the balance, creating perfect alignment between the sash and frame, while allowing the sash to tilt inward for cleaning.

Radiation - Energy transmitted directly from one object to another through the atmosphere or through transparent or translucent materials. The energy radiated is either transmitted, absorbed, reflected or a combination of all three.

R-Value - Resistance a material has to heat flow. The higher the R-Value, the greater the resistance.

Sash - The part of the window which contains the glass.

Single hung window - A window that has only one operable sash that slides vertically.

Single strength glass - Glass with a thickness of approximately 3/32".

Slider window - A window in which the sash moves horizontally. Sliders are available in a 2- or 3-lite configuration, with the 3-lite having operable end vents.

Sloped sill - The angles designed on a window sill.

Solar Heat Gain Coefficient (SHGC) - The amount of heat absorbed into the home from the rays of the sun.

Spacer - Material placed between two or more pieces of glass in order to maintain a uniform width between the glasses and prevent sealant distortion.

Stainless steel - Metal alloy that won't rust.

Tempered glass - Specialty glass that disintegrates into small, rounded particles instead of large, sharp fragments.

Tilt-latch - Mechanism that unlocks the sash and allows it to tilt in from the main frame.

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

U-value - The 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.