A louver (American English) or louvre (British English) 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.
Angled to control the air flow and ventilation.
Energy efficient to reduce heating and cooling cost.
Privacy, versatile and available in different design and styles.