A louver, often spelled “louvre” in some regions, is a set of angled slats or vanes designed to regulate light, air flow, or both, while also providing protection against rain, noise, and direct sunlight. Typically, louvers are made of metal, wood, or glass and can be found in a variety of applications including windows, doors, and walls, as well as on certain types of industrial equipment and vehicles. Louvers may be fixed, adjustable, or entirely operable, allowing for manual or automatic control over their position. In architecture, they serve both functional and aesthetic purposes, contributing to the energy efficiency of buildings by controlling the internal climate while also adding to the visual appeal of the structure. The design of a louver system takes into account factors such as the angle of the sun, prevailing wind patterns, and the desired level of privacy to optimize its effectiveness.

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