Louver

Concept drawing of a louver gable vent
Louvers used in a Stevenson screen
Louver exterior shutters in Italy
Louvered cupola bell house

A louver (American) or louvre (Commonwealth English; see spelling differences) is a framed opening fitted with horizontal slats in a structure. These slats (also sometimes called louvers/louvres) are angled to admit light and air, as well as to keep out rain and direct sunshine. The angle of the slats may be adjustable, usually in blinds and windows, or fixed, such as in exterior shutters.

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