Steel Window Kits are designed to be used on Type 4 and 12 enclosures. 29x19 inch window size. These kits are easily installed by making a cutout in the enclosure and attaching the window and frame in place. Frames are made from heavy-gauge steel with an ANSI 61 gray polyester powder finish over pretreated surfaces. The window is 0.25 inch (6 mm) acrylic for steel kits or 0.25 inch (6 mm) polycarbonate material for stainless steel kits. Oil-resistant gasketing ensures a water-tight seal around the perimeter of the window and frame.