An operating window that is hinged to open on either the left or right vertical jamb Marvin produces these windows in either wood or aluminum clad exteriors under the Casemaster trade name Marvin's Integrity product line also features a casement built from their ultrex fiberglass composite material
A casement or a casement window is a window that opens by means of hinges, usually at the side. a window that opens like a door with hinges at one side (Probably from encassement , from casse; CASE)