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A louver (American English) or louvre (Commonwealth English; see spelling differences) is a window blind or shutter with horizontal slats that are angled to admit light and air, but to keep out rain and direct sunshine. The angle of the slats may be adjustable, usually in blinds and windows, or fixed.
Exterior shutters were originally constructed for light control, privacy, security and protection from the elements. Many areas of tropical Australia, the Mediterranean, Africa, and the American South, feature exterior shutters that block the strong sun from windows. Functional shutters hinge on each side of a window or at the top and swing ...
Exterior louver systems often rely on adjustments from either complex servo motors or building occupants throughout the day to operate well. Both of these systems can be unreliable at times, reducing the overall benefit of having a daylighting system.
Natural ventilation is the intentional passive flow of outdoor air into a building through planned openings (such as louvers, doors, and windows). Natural ventilation does not require mechanical systems to move outdoor air. Instead, it relies entirely on passive physical phenomena, such as wind pressure, or the stack effect. Natural ventilation ...
The windows were covered by functional exterior shutters, which opened outward. Variants of casement windows are still the norm in many European countries. They are sometimes opened with a crank , lever , or cam handle , which is placed around hand height or at the bottom and serves as a window lock. [ 2 ]
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