Which air ducts can be used for smoke control and smoke extraction system?

The fire protection grade required by the smoke control and extraction system is A 1.

Material 1: phenolic resin. According to the national standard GB8624-2006, the fire resistance of phenolic resin is B 1, the fire resistance of color steel plate is A 1, and the comprehensive fire resistance rating of double-sided color steel composite phenolic air duct is B 1. Therefore, phenolic resin material is not suitable for smoke control and extraction system, and the fire acceptance cannot pass.

Material 2: glass fiber. According to the national standard GB8624-2006, the fire resistance of glass fiber is A 1, and that of color steel plate is A 1. According to their processing technology, they can all reach the standard of incombustible A 1, but not all color steel glass fiber composite ducts are suitable for smoke control and extraction systems. Glass fiber duct processing technology 1: slotting processing technology, because the slotted part in the middle needs to be bonded with glass glue or inorganic glue, the service life of glass glue or inorganic glue is generally 4-5 years, and the glue will age after 4-5 years. In case of fire, the smoke control system will be turned on, and the air volume will exceed 8M/S, so the colored steel plate produced by slotting processing technology will fall off and block the pipeline due to the aging of glue, which will cause serious consequences. Processing technology of glass fiber air duct 2: seamless processing of inner pipe. The seamless processing technology of inner tube adopts one-step molding technology, and the whole inner tube is a whole, without glue, without glue and glass fiber falling off. The overall fire protection level reaches incombustible A 1 level, which can be applied to smoke control and extraction systems.

Material 3: polystyrene. According to the national standard GB8624-2006, the fire resistance of polystyrene is B 1, the fire resistance of color steel plate is A 1, and the comprehensive fire resistance rating of double-sided color steel composite polystyrene duct is B 1. Therefore, polystyrene materials are not suitable for smoke control and extraction systems, and the fire acceptance cannot pass.

Material 4: glass magnesium. Glass magnesium, the chemical system is magnesium oxychloride cement. According to the national standard GB8624-2006, the fire resistance grade of glass magnesium is A 1. The physical properties of magnesium oxychloride cement are doomed to crack after thermal expansion and cold contraction, which is troublesome to maintain. Therefore, it is not recommended to use glass magnesium material in smoke control and smoke exhaust system.

Material 5: galvanized iron sheet. According to the national standard GB8624-2006, the fire resistance rating of galvanized iron sheet is A 1, so galvanized iron sheet is suitable for smoke control and extraction system.