Laminated Glass - Two or more pieces of glass bonded together over a plastic interlayer.
Lap-Lok® Meeting Rail - A patented meeting rail which overlaps and interlocks both sash.
Lift Handle - A handhold for raising and lowering the sash. Handle implies that the handhold is not continuous across the sash.
Lift Rail - A handhold for raising and lowering the sash. Rail implies that the handhold is continuous across the sash.
Lite - A unit of glass in a window.
Lock Rail - The horizontal section of the sash where the cam lock is attached.
Lock Stile - The vertical section of the sash where the cam lock is attached.
Low E (Emissivity) Glass - Glass with a transparent metallic oxide coating applied onto or into a glass surface. The coating allows short-wave energy to pass through but reflects long-wave infrared energy which improves the U-value.
Main Frame - The head, sill and jambs sections of a window.
Mechanically Fastened Frame - Refers to frames fastened with screws.
Meeting Rail - The horizontal sections of a pair of sash that meet when the sash are closed.
Meeting Stile - The vertical section of a pair of sash that meet when the sash are closed.
Mesh - Fabric made of either fiberglass or aluminum, used in the making of screens.
Mullion - A vertical or horizontal connecting unit between two or more windows.
Nailing Fin - An extrusion attached to the main frame of a window used to secure the unit to the rough opening.
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