Residential Glossary

glass from A to Z


Insulating gap between two sheets of glass, filled with air or gas to reduce heat transmission through the glass.

Awning Window

A window that is hinged at the top and opens outward.

Barrier-Free Door

Door with no bottom track, designed to offer accessibility to the physically challenged.

Bay Window

A window that projects out from the exterior wall.

Bow Window

A type of bay window that forms a curved arch.


A change in levels of the curb of a shower or tub enclosure.

Bi-Pass Window

Window where two glass panels travel in parallel tracks and overlap when closed.

Casement Window

A type of window that is hinged along one side and opens outward.


The trim around a window.

Divided Light

A window made up of two or more smaller panes.

Dual Seal (Insulated)

A window with two layers of glass separated by an air space. This helps increase the insulating value of the window.

Etched Glass

Glass that has been chemically treated or sandblasted.


Piece of metal hardware created by forcing softened metal through an extrusion die to shape it into its final form.

Framed Enclosure

Enclosure with metal extrusions protecting all its glass edges.

Frameless Enclosure

Enclosure that has minimized its use of metal extrusions.

Heavy Glass Enclosure

Frameless enclosure with glass that is 3/8” or more thick.

Hinge Door

Door that is attached by its side edge to the door frame.

Inline Panel

A glass panel that is in the same plane as the door of an enclosure.


The inside frame of the window.


A single piece of glass; a pane.


A special coating for window glass that reduces the transmission of radiant heat and ultraviolet rays through the glass.


The frame that separates individual lights in a window.

Neo-Angle Enclosure

Enclosure for use in a corner; it has two sides and a door, with the door being in the center.

Obscure/Patterned Glass

Glass that allows light to pass through indirectly, without giving a clear view.

Pivot Door

Door attached at the top and bottom by a pivot mechanism. When the door opens, it pivots at the point of connection, usually an inch or two in from the door frame.

Powder Coating

The painting of aluminum extrusions by dusting with a dry powder and heating until the powder melts, forming a tough coating of paint on the surface of the extrusion.


The measure of relative insulating value of different materials.

Reflective Glass

Glass that reflects about 70 percent of light.

Return Panel

Glass panel set at an angle to the door or other panels of an enclosure.


The fixed or moveable frame that holds the window lights.


The side parts of a sash frame.


A piece of molding that is attached to the sash or jamb and holds the glass in place.

Storm Sash

An extra sash placed over a window for added insulation in winter; also called a storm window.

Tempered Glass

Glass that has been specially heat strengthened and is several times stronger than plate glass so that, should it break, it shatters into thousands of glass beads, minimizing the risk of harm to anyone nearby. It is very difficult to break tempered glass; use of it for all glass enclosures is required by code.

Tinted Glass

Glass that only allows certain colors of light to pass through it. The most popular tints in enclosures are bronze or gray.


Glass panel over an enclosure often used for showers with steam applications. Can often be operable or fixed.

Triple Glazing

A window with three layers of glass, separated by air spacers.