Louver

Type of louver in concept
Louver used in a Stevenson screen
Louver shutters in Italy
Louvered cupola bell house

A louver (American English) or louvre (British 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.[1]

  1. ^ "Definition from "The Free Dictionary"". Retrieved 2 March 2014.