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Glossary

Term: Window

A manufactured assembly of a frame, sash, glazing and necessary hardware, made to fit an opening in a wall. Components of a window may include the following:

Window sill: horizontal member at the base of a window opening.
Window head: horizontal member at the top of a window opening.
Window jamb: either of the vertical members at the sides of a window opening.
Mullion: A vertical member between the glazed units.
Rail: A horizontal member between the glazed units.
Glazing: The glass portion of the window.
IGU: Insulated glazing unit. Double or triple panes of glass sealed together to provide insulation value. The still gas between the panes acts as the insulation.
Condensation track: a channel at the interior sill level of the window intended to intercept small amounts of water condensing on the interior surface of the glass.

Source: The Future of Window Technology…Is Here!; Windows and Occupant Comfort

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