fire control Construction of smoke exhaust works What are the requirements for system materials?
1. Smoke exhaust pipe
Fire smoke exhaust Ventilation engineering The smoke exhaust pipe body, frame, fixing materials, sealing materials and flexible joints in the system must be made of non combustible materials.
When there are combustibles in the ceiling, the smoke exhaust pipe in the ceiling shall be insulated with non combustible materials, and shall be kept at least 150mm away from combustibles.
fire control Smoke exhaust works construction
2. Positive pressure air supply pipe
The construction air supply pipe of fire smoke exhaust and ventilation engineering shall be made of non combustible materials. When metal air duct is used, the wind speed of the pipe shall not be greater than 20m3/s; When non-metallic materials such as concrete with smooth inner surface are used for air duct, it shall not be more than 15m3/s.
When the pressurized air supply pipe passes through the area with possible fire, the fire resistance limit of the air pipe shall not be less than 1h
The air supply shaft shall be separated from the adjacent parts by a partition with a fire resistance rating of no less than Ih. When an inspection door is required on the wall, a Class C fire door shall be used.
3、 Ventilation duct
The pipes of the pipeline system of fire ventilation engineering shall be made of non combustible materials.
Air ducts and flexible joints in contact with corrosive media can be made of fire-resistant materials.
The covering material of composite air duct must be incombustible, and the internal thermal insulation material should be incombustible or flame retardant B1 grade, and harmless to human body.
4. Thermal insulation and noise elimination materials
Thermal insulation materials, silencing materials and adhesives for fire smoke exhaust and ventilation engineering pipes and equipment shall be incombustible materials or refractory materials.
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