The amount of air that passes between a window sash and frame. In windows it is measured in terms of cubic feet or air per minute, per square foot of area. The lower the number, the less air the windo [..]

A top-hinged window that swings outward for ventilation. Bay Window – An angled combination of three windows that project out from the wall of the home. The windows are commonly joined at 30- or 45-de [..]

Small hollow tubes which penetrate the spacer system of an insulating glass unit. They allow pressure equalization between manufacturing locations, shipping, and installation locations. Since the insu [..]

Energy transfer from one material to another by direct contact.

Heat transfer by currents that flow from a warm surface to a colder one.

A piece of glass or I.G. unit with a sash profile around it; not set within the main frame of a window unit.

A window that has two operable sash which slide vertically.

The process of joining materials by melting them together with extreme heat (over 500ºF), resulting in the materials uniting into a one-piece unit.

Specially designed windows classified as either Straight line Geometrics such as rectangles, triangles, trapezoid, octagons, pentagons, etc., or Radius Geometrics which include Half-rounds, Quarter-ro [..]

The process of sealing the glass to the sash.