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Testimonials
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Please use our glossary to help become more familiar with the words, terms and phrases commonly found and used in the screens, windows and doors industry. You may either display the set of terms by A-Z or use our search form below to look for a particular term.
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| Laminated Glass |
| Two or more lites of glass bonded together with a plastic inner layer. A typical application is a car’s windshield. |
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| Laminated Glass |
| Two or more sheets of glass with an inner layer of transparent plastic to which the glass adheres if broken. Used for safety glazing and sound reduction. |
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| Latch |
| A mechanism having a spring-activated beveled latch bolt. Retraction of the latch bolt is by lever handle or knob. |
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| Leaf |
| An individual door used either in a single or multiples (leaves). |
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| LEED |
| Leadership in Energy and Environmental Design. Rating system for the design, construction, and operation of high-performance green buildings. |
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| Left Or Right |
| Location information, always outside looking in, that can be used to specify direction, e.g., "the operating sash slides to the right." |
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| Level |
| The condition of perfect horizontal alignment. |
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| Lever Handle |
| A bar-like grip which is rotated about an axis at one of its ends to operate a locking or latching device. |
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| Lift |
| Handle for raising the lower sash in a single-hung or double-hung window. Also called Sash Lift. |
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| Light Or Lite |
| A separately framed piece of glass in a window or door. Sometimes spelled 'Lite." A single (monolithic) glass pane or piece. |
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| Light-to-Solar-Gain Ratio |
| A measure of the ability of a glazing to provide light without excessive solar-heat gain. It is the ratio between the visible transmittance of a glazing and its solar-heat gain coefficient. |
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| Lintel |
| A horizontal structural member that spans an opening at the head to carry the weight of construction above the opening. |
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| Liquid Crystal Glazing |
| Glass in which the optical properties of a thin layer of liquid crystals are controlled by an electrical current, changing from a clear to a diffusing state. |
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| Lite |
| A single or monolithic glass pane. |
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| Liveload |
| Loads from non-permanent parts of the building (window washing and glazing rigs are liveloads). |
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| Lock Backset |
| Distance from the edge of the locking stile to the centerline of the cylinder, measured parallel to the face of the door. |
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| Lock Face Plate |
| The exposed plate set on the edge of a door to cover a locking mechanism. |
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| Lock, Dead Lock |
| A lock in which a bolt is moved by means of a key or thumb turn and is positively stopped in its projected position. |
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| Long-Wave Infrared Radiation |
| Invisible radiation, beyond red light on the electromagnetic spectrum (above 3.5 micro meters), emitted by warm surfaces such as a body at room temperature radiating to a cold window surface. |
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| Louvers |
| Glass, metal, or vinyl slats, either movable or fixed; as in a Jalousie window |
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| Low E Glass |
| A transparent coating applied to a glass surface to separate long wave (heat) energy and short wave (light) energy. The long wave is reflected back to the heat source. The short wave is allowed to pass through the coating. |
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| Low E II Glass |
| Low E stands for "low emissivity" and is designed to improve thermal performance. Low E II glass is coated twice with microscopic metal or metallic oxide layers to reflect or absorb the sun's warmth, as well as reducing the damage from UV rays. |
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| Low-Conductance Spacers |
| An assembly of materials designed to reduce heat transfer at the edge of an insulating window. Spacers are placed between the panes of glass in a double- or triple-glazed window. |
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| Low-E Glass |
| Low emissivity glass; a type of reflective glass used to reduce radiation heat transfer and improve the U-value of the glazing. |
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| Low-Emittance (Low-E) Coating |
| Microscopically thin, virtually invisible, metal or metallic-oxide layers deposited on a window or skylight glazing surface primarily to reduce the U-factor by suppressing radiative heat flow. A typical type of low-E coating is transparent to the solar spectrum (visible light and short-wave infrared radiation) and reflective of long-wave infrared radiation. |
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