Abstract: A portable and removable window exhaust system for home appliances requiring outdoor venting (such as portable laundry dryer) which obviates the necessity of permanent installation and piercing an exterior wall of a building to vent the appliance to the outdoors. The main part of the system, the exhauster, is incorporated in a replacement window panel consisting of two transparent perimetrally reinforced sheets of clear transparent plastic, and forms an integral part of one of said window panels. The said exhauster is movable within the window replacement panel and, when in closed position, will not protrude from the outside of the window replacement part, giving appearance of regular closed window. Moreover, in the open position, the exhauster resembles a protective hood equipped with inter-connected spaced ribs forming a grill at the bottom edges of said exhauster, which perform as an exhaust outlet.