The Arch Aluminum & Glass IGS 450 EZ Storefront Thermal Storefront, with its 25 year history of proven field performance, is one of our staples in storefront construction. This system meets a wide range of project requirements and continues to be recognized by architects as a reliable and economical product. This highly versatile 2" x 4-1/2" system can accommodate 1/4", 3/8", 1/2", and 1" glazing infill. The extensive line of Arch Aluminum & Glass entrances are easily integrated into this system. The extensive line of Arch Aluminum & Glass entrances are easily integrated into this system. The IGS 450 EZ Thermal Storefront Framing System is available in anodized, environmentally friendly ArchKote 1000™ or ArchKote ™ 6000 powder coat, and liquid or Fluoropolymer painted finish.