The window glass on the fire door cannot be made as large as you want. There are strict regulations in this respect. The area of the fire glass in a glass fire door exceeds 15% (referring to the glass inlaid with a single door leaf compared with the door leaf), and does not exceed At 30%, it is regarded as a different unit. The area of fireproof glass with glass fireproof door exceeds 15%, and cannot be classified as the same unit with the area of fireproof glass less than or equal to 15% of the door area. The area of fireproof glass reaches or exceeds 30% of the area of the fireproof door leaf as a glass fireproof door.