Explosion-proof doors: to resist the explosion accidental industrial building outside of the device, and ensure the safety of personnel and industrial equipment inside the building in good condition, free from blast damage; effectively prevent the continuation of an explosion hazard. The use of special steel industry in accordance with strict mechanical data set production, and with high-performance hardware accessories, to use more practical and beautiful. Protection of life and property safety. Fire doors: various buildings within a high temperature to prevent the spread of fire doors and settings. There are steel and wood. Fire doors and smoke strip affixed around the box, it can be inflated in the fire season dead gaps, reduce the spread of smoke. Were graded A, Class B and C, the fire resistance of their time is 120 minutes, respectively, 90 minutes, 60 minutes. Over this time may no longer have a role in the fire barrier.