The fire resistance time of Class B steel fire door shall not be less than 1.0 hour, and the hardware fittings used on the fire door must also be fire-resistant hardware fittings. Usually, the fire door of this grade is generally used for the entrance door of family decoration.

fire resistant doors for flats,steel doors and windows,steel sliding door,steel door frame,fire exit door dimension,fire rated metal doors near me,

fire rated door with louvre,steel door frame,exit door sign,exit door price,fire resistant doors for flats,fire rated metal door frame sizes,fire exit door dimension,

metal front door,fire rated metal door frames,fire resistant doors for flats,fire door closer,fire exit door dimension,walmart fire exit door,steel door frame