For steel fireproof doors, vision panel windows on the fire doors must also be fireproof as required. Steel fire door with window are more harmonious and beautiful visually, with good light transmittance and are more popular.
For steel fire door with window, Asico door adopts high-performance fireproof glass with good light transmittance. At present, we use the national glass brand UL.R27111. The maximum fire resistance can reach 3 hour. The maximum size can be 100 square inches (0.065 square meters), 12 inches (305mm) wide and 33 inches (838mm) high.
The shape of windows can also be selected, the most common are square windows and round windows.
Compared with ordinary glass, it has the following advantages：
1. Safety: the fragments of high-quality fire-proof glass are in obtuse angle state after being broken, and the fragments of toughened glass are smaller, that is to say, even if they are damaged, they will not cause harm to human body.
2. It effectively solves the problems of leakage, discoloration, blistering and atomization of other ordinary glass
3. In case of high temperature, the glass is not easy to fog, and the visual effect is good.
Generally speaking, for single opening steel doors, we install visual panels for customers on the side of the partial handle, and double opening steel doors can be equipped with a glass window on the left and right respectively.