Exhaust system for laundry dryer

An air exhaust system for a laundry dryer located in a room having a window including a window frame and a window sash slidable therein, and having an air exhaust outlet, comprising a window insert plate assembly removably inserted within said window frame and with said window sash contacting an edge of said window insert plate assembly, said window insert plate assembly including telescopically-engaged rectangular plate sections to fit window frames of different widths, one of said plate sections having an aperture, a unitary box-like closure means movably mounted within said aperture for movement between an aperture closing position and an aperture opening position, said box-like closure means including an outside plate, a side wall having a venting opening adjacent said outside plate and a nipple connected to said side wall and remote from said outside plate inwardly of the latter and communicating with the interior of said box-like closure means, said side wall and its venting opening being disposed inwardly of said one plate section and said outside plate closing said aperture and flush with said one plate section in the aperture closing position of said box-like closure means, said side wall and outside plate protruding outwardly from said one plate section in the aperture opening position of said box-like closure means with said venting opening being located completely outside of said one plate section, and further including a flexible venting hose having detachable connecting means at both ends for detachably connecting one end of said hose to said nipple and the other end of said hose to the exhaust outlet of said laundry dryer, said box-like closure means preventing air circulation between said room and the outside, in both positions of said box-like closure means when said hose is connected to said nipple and to said laundry dryer.