If a large project uses a bag air duct for air supply, it will be divided into material classes at the time of bidding. In industrial places, there are fire protection requirements for materials, and the requirements of fire protection grade A or B in different places are not the same. The material used in MX bag air pipe is tested by the National Fire Prevention Building Materials Quality Supervision and Inspection Center, and can meet the fire prevention requirements of different levels in different places.

What is the fire rating of the bag air duct? You should also clearly distinguish GB8624-2012 and GB8624-2006:

Archived and managed by the Fire Prevention Materials Sub-Committee of the National Fire Standardization Technical Committee, the Sichuan Fire Research Institute of the Ministry of Public Security is responsible for the revision of the mandatory national standard GB8624-2012 "Classification of combustion performance of building materials and products", which has been officially issued by the National Standardization Management Committee and implemented on October 1, 2013. The classification and classification criteria of combustion performance grades are mainly modified, as follows:

GB8624-2012 standard divides materials into four grades: A, B1, B2, B3. Class A - non-combustible materials, B1- non-combustible materials, B2- combustible materials, B3- flammable materials. The GB8624-2006 standard divides materials into seven grades: A1, A2, B, C, D, E, F.