Laminated glass This glass is constructed by placing a plastic interlayer between two panels of glass. The interlayer helps protect the glass from impacts and prevents shattering.
	Leaf seal weatherstrip In this weather-seal process, the void is filled with a weather-strip that expands to fill the void.
	Lean manufacturing This is a business philosophy and strategy that’s focused on eliminating all manufacturing steps or processes that do not add value to the final product or service.
	Legacy hardware Legacy hardware is a lever lock with a sweeping handle design for swinging patio doors.
	Length of Embedment The length of the fastener that penetrates the structure framing.
	Level A condition that exists when a surface is exactly horizontal.
	Lever Operator A window opening mechanism that has a handle that pivots right and left to open and close an awning window.
	Lido-style hand set This is a patio door lever lock with a sweeping handle set.
	Lift rail This rail on a double hung or single hung window is designed with an integrated method of lifting the operating sash.
	Liner See jamb extension.
	Lintel See header.
	Lite (also Light) A framed opening in the glass within a sash or door panel; frequently used in reference to glass divided by a grid into multiple smaller openings.
	Lock bar This is a hinged lock most often used for double-hung and single-hung windows or sliding patio doors.
	Lock block A lock block is a solid or glued wood component that’s the thickness of a hollow core interior door or steel exterior door stile, which is joined to the inside edge of the stile. This will allow a lock to be installed in this location.
	Lock Rail The intermediate rail of a door at lock height.
	Louver An opening with a series of horizontal slats, called louver boards, arranged sloping downward to permit ventilation but exclude rain, sunlight or vision. Louvers can be made in various shapes.
	Louver Door A panel door with part or all of the panels replaced by louvers; a blind door.
	Low-E glass This type of insulating glass significantly blocks harmful ultraviolet (UV) rays and the sun’s infrared heat, so homes stay cooler in the summer and interior furnishings fade less. In the winter, it helps keep homes warmer and reduces condensation. It also delivers greater visible light transmittance than tinted glass.
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