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Levolux - Glossary

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Austrian Blind

A gathered blind made longer than necessary. The extra fabric forms ruching at the bottom.


Canvas, aluminum or corrugated glass-fiber panels set over a storefront, building entrance or window opening; provides shelter from inclement weather and reduces solar gain

Blackout lining

A layer of opaque material is sandwiched between two layers of cotton fabric. In this way all light is excluded. Some are heavy and difficult to penetrate with a needle, while others are softer. Both will add to the weight but will also improve the draping qualities. Usually in cream or white.


A generic term many people use to describe window coverings.

Bottom rail

The bottom of a shade or blind.

Brise Soleil - (French, lit. sun break)

A screen of projecting fins or slats which deflect direct sunlight from windows.


Usually two rectangles of fabric hung from a track or pole to decorate a window and give privacy. A window covering to floor- or sill-length, usually with fullness in the width, which is sometimes hung alone or on one side of a window but more often is used in pairs. It hangs from a rod or pole by means of hooks or tabs or is slotted onto a rod. A term often used to mean a drapery.

Direct sunlight (beam sunlight)

Daylight directly from the sun without any diffusion.

Disability glare

Glare resulting in reduced visual performance and visibility. Often accompanied by discomfort glare.

Discomfort glare

Glare producing discomfort. It does not necessarily interfere with visual performance or visibility.


The optical effect due to the variation of sheet glass thickness.

Dress Curtains

Curtains that are never intended to be closed; used for decorative purposes only.

Festoon Blinds

Often confused with Austrian blinds the difference being that a Festoon blind is ruched from top to bottom.


“Fin”, or “aerofoil”, generally refers to a symmetrical or non-symmetrical wing-type extruded hollow section.


High luminosity values from a point, line, or area source that may affect the visual amenity, depending on luminosity, background illumination, adaptation of the eye, and area size. There are upper limits for physiological glare (damage to the eyes) and psychological glare (feeling of discomfort).


High luminosity values from a point, line, or area source that may affect the visual amenity, depending on luminosity, background illumination, adaptation of the eye, and area size. There are upper limits for physiological glare (damage to the eyes) and psychological glare (feeling of discomfort).


A generic term used to describe an infill material, such as glass or window assemblies in general. Also refers to the process of applying or installing glass into a window or door sash.

Heat Gain

Instantaneous rate of heat gain at which heat enters into and/or is generated within a space. Latent heat gain occurs when moisture is added to the space (from occupants or equipment). Sensible heat gain is added directly to the space by conduction, convection, and/or radiation.

Light-redirection system

A glazing unit or panel, possibly retrofitted, which intercepts incident sunlight and sky light and specularly reflects it in another direction, usually toward the ceiling.


Slanted fins or slats in a window, ventilator, or venetian blind; the slats may be fixed or adjustable, and made of wood, metal, glass, or plastic.


One of a series of horizontal boards or slats set at angle to prevent rain entering an opening.

“Louvre” is generally the description of the shape of a “Z” or “J” shaped extrusion.


Vertical bars of stone or wood dividing the lights of a window.


The fraction of incident radiation upon a surface that is reflected from that surface.


The process by which incident flux leaves a surface or medium form the incident side, without change in frequency.

Roller Blind

A flat blind made from pre-stiffened fabric which is rolled up around a pole at the top of the window.

Roman Blind

A flat blind which is pulled up into soft horizontal folds using cords attached to the back of the blind.

Solar heat gain

Heat from solar radiation that enters a building.

Solar Heat Gain Coefficient (SHGC)

The fraction of solar radiation admitted through a window or skylight, both directly transmitted and absorbed, and subsequently released inward. The solar heat gain coefficient has replaced the shading coefficient as the standard indicator of a window's shading ability. It is expressed as a number between 0 and 1. The lower a window's solar heat gain coefficient, the less solar heat it transmits, and the greater its shading ability. SHGC can be expressed in terms of the glass alone or can refer to the entire window assembly. For near-normal incidence only, SHGC = 0.86 x SC. See also Shading Coefficient (SC).

Solar radiation

The total radiation of energy from the sun, including ultraviolet and infrared wavelengths as well as visible light.

Structural glazing

Glazing which is part of the structural design of a building.

Venetian blind

A light-controlling shading device consisting of overlapping thin, horizontal slats which can be raised or adjusted from wide open to closed positions by varying the tilt of the slats.

Ventilation Louvres

An opening for ventilation purpose which has vanes fitted one on top of the other and sloped at about 45 degrees to keep out the rain

Vertical blind

A blind vertically aligned vanes, made of either vinyl, fabric, or fabric inserted into vinyl.

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