The smoke prevention and exhaust duct is an important part of the fire protection system. When a fire occurs in a building, the smoke prevention and exhaust duct can discharge the indoor toxic fumes to the outside, and send natural air to the room, so as to escape the trapped people and rescue the firefighters. Provide valuable time. So, what material is the fire protection package of the fire exhaust duct?

　　Whether the production materials of the smoke prevention and exhaust ducts meet the requirements and whether the installation and construction meet the specifications is very important. In the "Standards for Smoke Prevention and Exhaust Systems in Buildings", specific requirements for smoke prevention and exhaust ducts are made. For example, the wrapping materials of the smoke prevention and exhaust ducts are required to meet the Class A non-combustible fire rating, and the fire resistance period is 1 to 2 hours.

　　The fire-proof smoke exhaust duct is wrapped with glass wool. Glass wool is a kind of glass fiber inorganic material. The glass wool used for smoke prevention and exhaust ducts includes glass wool board and glass wool felt. The former is a sheet and the latter is a coil. Uetersen glass wool meets the fire resistance limit and thermal insulation requirements of the "Technical Standard for Smoke Prevention and Exhaust Systems in Buildings" GB51251. It belongs to fireproof and thermal insulation building materials, and reaches the standard of Class A non-combustible fireproof building materials.

　　In question 27 of the local standard "Guangdong": the smoke prevention and exhaust air duct is made of steel plate, and the overall fire resistance time should meet the requirements of the specification. For example: (1) The smoke-proof air duct of the independent pipe well adopts the steel plate air duct, and the smoke-proof air duct in other places adopts the steel plate and the fireproof plate; (2) The smoke exhaust air duct adopts the steel plate air duct and the fireproof plate (including the garage exhaust air duct). (3) The ceiling smoke exhaust duct adopts: steel plate covered with fireproof board and 40mm thick insulation glass wool (if the ceiling has no combustible material, glass wool may not be added); steel plate covered with fireproof board can be processed on site or finished product processing.