Profile: Kelly Window Systems, Inc. is a producer of aluminum & vinyl window and door systems. Our products include double hung, horizontal sliders, casement & awning, bays & bows, entry door systems and patio door system. Our sliding glass doors features include reversible door panel, interlocking meeting rails and durable extruded aluminum screen. Our architectural terrace doors features include thermally broken aluminum extrusions, sloped sill and multi point locking system.