A domed structure on a roof, with side openings for ventilation
A louver (American English) or louvre (British English), from the French l'ouvert; "the open one") is a window, blind or shutter with horizontal or, less often, vertical slats, that are angled to admit light and air, but to keep out rain, direct sunshine, and noise.
Each of a set of angled slats or flat strips fixed or hung at regular intervals in a door, shutter, or screen to allow air or light to pass through
(louver) one of a set of parallel slats in a door or window to admit air and reject rain
(louvered) supplied with louvers for ventilation; "a louvered door"
Close the shutters of (a window or building)
Close (a business)
a hinged blind for a window
a mechanical device on a camera that opens and closes to control the time of a photographic exposure
close with shutters; "We shuttered the window to keep the house cool"