Louver

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For the French museum, see the Louvre

A louver (or louvre in British English, from French l'ouvert; "the open one") is a frame with horizontal and vertical slats, which are angled to admit light and air, but to keep out rain and sun shine.With the betterment in building management services and the fast rapid changing technology these louvers have been automated to save upon the overall cost and yet provide with ambient living environment inside the buildings.

Louvers originated in the Middle Ages as lantern-like constructions was fitted on top of roof holes in large kitchens to serve as ventilation while still keeping rain and snow out. Originally rather crude constructions consisting merely of a barrel they evolved more elaborate designs made of pottery, taking the shape of faces where the smoke and steam from cooking would pour out through the eyes and mouth, or into constructions that were more like modern louvers, with slats that could be opened or closed by pulling on a string.