The amount of air leaking in and out of a building through cracks in walls, windows, and doors.
Inside flat trim member that is used under the stool at the bottom of a window.
A colorless, odorless, non-flammable, non-reactive, inert gas which acts as an insulator between the panes of glass in a sealed unit.
An operating style of window with a sash hinged on the sides, and swings open at the bottom towards the exterior.
Outside casing around a window to cover jambs and through which nails are driven to install the window.
A combination of three or more windows consisting of central picture or fixed window and flanked by two flanking units at 30°, 45° or 90° angles to the wall.
A combination of four or more window units attached at an angle to give the impression of a curve.
A mechanical device, normally spring loaded, used in hung windows to counterbalance the width of the sash during opening and closing.