GB 7693-1987 "Safety procedures for painting operations, ventilating and purifying the pre-painting process" stipulates the ventilating and purifying requirements for the pre-painting process, mainly for the treatment of indoor ferrous metal workpieces. The standard covers measures to ensure safe and hygienic working conditions, including the design and maintenance of ventilating systems, to protect the health of workers and prevent the accumulation of harmful substances and their impact on the environment. The treatment of outdoor and Miscellaneous material workpieces can be implemented with reference to this standard.