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The intensity variation of sunlight across its spectral range.
A coated or tinted glazing with optical properties that are transparent to some wavelengths of energy and reflective to others. Typical spectrally selective coatings are transparent to visible light and reflect short-wave and long-wave infrared radiation.
A condition that exists when 2 surfaces are perpendicular.
The upright or vertical edges of a door, window, or screen.
Treated glass that is strengthened by reheating it to just below the melting point and then suddenly cooling it. When shattered, it breaks into small pieces. Approximately five times stronger than standard annealed glass; is required as safety glazing in patio doors, entrance doors, side lights, and other hazardous locations. It cannot be recut after tempering.
An element of low conductance placed between elements of higher conductance to reduce the flow of heat. Often used in aluminum windows.
The member that lies at the bottom of a sliding glass door or swinging door; the sill of a doorway.
A single- or double-hung window whose operable sash can be tilted into the room for interior washability.
Glass colored by incorporation of a mineral admixture. Any tinting reduces both visual and radiant transmittance.
The percentage of radiation that can pass through glazing. Transmittance can be defined for different types of light or energy, e.g., visible light transmittance, UV transmittance, or total solar energy transmittance.
A window, usually rectangular, placed over a door or window.
The overall heat transfer coefficient that describes how well a building element conducts heat. It measures the rate of heat transfer through a building element over a given area under standardised conditions. A lower U-factor is better at reducing heat transfer. U is the inverse of R (U=1/R) and is used in the U.S. to express the heat flow through entire assemblies (such as windows and doors). On the other hand, R-value is widely used to describe the thermal resistance of insulation products, layers, and most other parts of the building enclosure (walls, floors, roofs).
The invisible rays of the spectrum that are outside of the visible spectrum at its short-wavelength violet end.Ultraviolet rays are found in everyday sunlight and can cause fading of paint finishes, carpets, and fabrics.
The movable framework or sash in a glazed window that is hinged or pivoted to swing open.
Polyvinyl chloride material, which can be both rigid or flexible, used for window frames.
The percentage or fraction of the visible spectrum weighted by the sensitivity of the eye, that is transmitted through the glazing.
The use of low-conductance spacers to reduce heat transfer near the edge of insulated glazing.
A strip of resilient material for covering the joint between the window sash and frame in order to reduce air leaks and prevent water from entering the structure.
A small opening in a wall or window sill member through which water may drain to the building exterior.
A glazed opening in an external wall of a building; an entire unit consisting of a frame sash and glazing, and any operable elements.
Various devices and mechanisms for the window including catches, fasteners and locks, hinges, pivots, lifts and pulls, pulleys and sash weights, sash balances, and stays.
