Window Terminology: Window Terms Starting with "T"

Tempered Glass

Treated glass that is strengthened by reheating it to just below the melting point and then suddenly cooling it. When shattered, it breaks into small pieces. Approximately five times stronger than standard annealed glass; is required as safety glazing in patio doors, entrance doors, side lights, and other hazardous locations. It cannot be re-cut after tempering.

Threshold

The member that lies at the bottom of a sliding glass door or swinging door; the sill of a doorway.

Tilt Window

A single- or double-hung window whose operable sash can be tilted into the room for easy cleaning.

Triple Casement

A window unit that consists of three casements all mulled together.

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