• Air Chambers - Small honeycomb spaces within the sash and frame which help to insulate and strengthen the window.
• Air Infiltration - 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 window lets pass through.
• Air Latch - Latch mechanism on the interior face of the sash that retains the window in a partially open position for ventilation.
• Air Lok - Latch mechanism on the interior face of the sash which retains the window in a partially open position for ventilation.
• Angled Exterior - A sloped extension from the frame that adds an aesthetically-pleasing dimension to the exterior of the window.
• Argon Gas - An odorless, colorless, tasteless, non-toxic gas which is six times more dense than air. It is used to replace air between the glass panes to reduce temperature transfer.
• Awning Window - A top-hinged window that swings outward for ventilation.
• Balance covers - Covers the balance cavity holding the coil-spring balance system inside the jamb.
• Balance System - Device for holding vertically sliding sash in any desired position through the use of a spring or weight to counterbalance the weight of the sash.
• 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-degree angles.
• Beveled Exterior - An angled extension from the frame that adds an aesthetically-pleasing dimension to the exterior of the window.
• Bow Window - An angled combination of windows in 3-, 4- or 5-lite configurations. The windows are attached at 10-degree angles to project a more circular, arced appearance.
• Butyl - A rubber material that seals the glass to the spacer, creating an airtight and water-tight IG unit. Butyl has the lowest gas permeability of all rubbers.
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