Glossary - G

A Glossary of window terminology

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Grille (Grilles)Wood, plastic or metal dividers, (grilles, grids, bars) designed for a single light sash or panel to give the appearance of muntins in as multi-light sash or panel. These can be removable or fixed. Also called Muntins. 

Grilles-Between-The-Glass (GBG)

Grilles are permanently installed between the panes of the insulating glass.

Garden window
Designed much like a bay or bow window, a garden also extends from the wall to the exterior of the home. It is built in a square or rectangular shape at right angles. The two side lights often operate for added ventilation.

Gas Fill
A gas other than air, usually argon or krypton, placed between window or skylight glazing panes to reduce the U-factor by suppressing conduction and convection.

Glazing Bead
A molding or stop around the inside of a window frame to hold the glass in place.

Grids
Optional horizontal or vertical lineals installed between the glass panes help to create the appearance of a divided window design.

Geometric Window
Specialty windows of various shapes including: rectangles, triangles, trapezoids, octagons, pentagons, half-rounds, quarter-rounds, full rounds, sectors and ellipses.  

Glass Stop
The trim that covers the edge of the glass.  

Grain
An arrangement and direction of wood elements or fibers; can be straight or spiral grain; also used loosely to indicate texture.  

Guide Bar Operator
A window-opening mechanism that has a track along the interior bottom rail of an awning sash. It allows the operating arms to slide as the window opens and closes.