• Fire compartments: Class C factory buildings (secondary fire resistance class) are not allowed to be larger than 8,000 square meters for single floors, 4,000 square meters for multi-storey buildings, and 2,000 square meters for high-rise buildings. If it cannot be divided, an automatic sprinkler system can be installed to double the area.
• Fire hydrant system: Generally, an outdoor fire hydrant system should be installed around the factory building. When the construction volume of a category C factory building is not less than 20,000 cubic meters and less than 5,000 cubic meters, the designed flow rate of the outdoor fire hydrant should not be less than 25L/S. The water output is 10-15L/S. For Class C factory buildings larger than 300 square meters, an indoor fire hydrant system needs to be installed, and the distance between indoor fire hydrants must be greater than 30 meters.
• Automatic sprinkler system: In Category C factory buildings, if there are rooms on the ground where people often stay or there are many combustible materials, and the building area is greater than 3000 square meters, an automatic sprinkler system should be installed. For Category C production workshops without windows (underground or above ground) or their interior rooms, when the construction area is greater than 50 square meters, automatic sprinkler systems should be installed in the rooms.
• Smoke exhaust facilities: Class C production sites with many people or combustibles; in Class C factory buildings, above-ground rooms with a construction area greater than 3,000 square meters where people often stay or with many combustibles; Smoke exhaust facilities shall be provided when the building area of similar production workshops or their inner rooms is greater than 50 square meters. When the requirements of natural smoke exhaust are not met, a mechanical smoke exhaust system needs to be installed. 
In addition to these fire protection requirements, Class C workshops should also abide by relevant fire protection regulations and standards, regularly inspect and maintain fire protection facilities, strengthen fire safety education and training, and improve employees' fire awareness and capabilities.