Jalousie window is a window which is composed of parallel glass, acrylic, or wooden louvers set in a frame. The louvers are locked together onto a track, in order that they could be tilted open and shut in unison, to govern airflow through the window. They're usually controlled by a crank mechanism. A patent for a louvered window was requested in the States in 1900 and patented November . Twenty-six, 1901. Patent 687705 by Joseph W. Hiker , OF Malden, Massachusetts. Jalousie windows are best-suited for porches that aren't climate-controlled and are found in mild-winter climates, and therefore were common on mid-20th-century houses in Florida, southern California and the deep South.They have got the gain that they can remain open during heavy rains and yet ( as the glass louvers protrude outward ) keep the majority of the rain from entering in through the windows ( one more reason for their recognition in these warm, wet climates ). They're also still in use and intensely often found in Hawaii. They aren't OK for scenarios where weathertightness or energy conservation are a concern, since it's not possible to attain a good seal between panes. It's also extremely tough to secure this design, as the slats are very frequently simply and noiselessly removed, that has seen a lot of them removed and replaced with updated security windows, at least in the UK.
They were also generally used in mobile houses during the 1950s and 1960s, before most mobile home makers commenced making the switch to more traditional sliding and sash windows in the 1970s and '80s. In the United Kingdom, these windows are typically known as "louvre windows". They also are called slated/ louver / glass crankout windows in certain legal circles ; jalousie windows with very wide louvered panes ( e.g. Over 6 inches ) are often called covering windows.