The difference between Class A and Class B fire doors; Different fireproof materials: Class A fire door and Class B fire door frame and door leaf have the same thickness of steel plate. The thickness of the door frame steel plate is 1.2mm, and the thickness of the door leaf plate is 0.8mm. The difference between the materials is the inside. The thickness of the built-in fireproof rock wool board, the thickness of the rock wool board of the Class A fire door is 52mm, and the thickness of the rock wool board of the Class B fire board is 46mm, so the thickness of the fire door of the Class A fire level is 54mm, the fire level of Class B fire The thickness of the door leaf is 48mm, the thickness of the fireproof glass of the Class A fire door: 35mm, the thickness of the fireproof glass on the fire door of Grade B and Class C: 25mm. The location of use is different: Class A fire doors are generally used in the engine room, oil depot, warehouse, etc. Fire exits and inflammable and explosive places, Class B fire doors are generally used in ordinary fire exits.

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