The 450 (1-3/4 x 4-1/2) series is most versatile for exterior applications, since its design to meet higher performance standards. All the systems components are designed to allow interchangeability making them ideal for either exterior or interior application. The series are industry standard center glazed systems that receive all standard entrance door hardware and the door type single or double action door hardware. This system will receive 1/4 glass in a glass pocket width and can be shop or filed fabricated. The extrusion can be reinforced to meet more rigorous performance requirement.