Gas emission outside of the painting rooms, equipped with worm-shaped activated carbon or double-layer activated carbon fiber absorbing setting for VOC treatment, it can comply with the environmental protection laws and rules of the local areas and countries of the buyers. Other painting rooms: 1) Water curtain painting room: According to the working pieces, manufacturing characteristics and the technical ideas of buyers, there are single-layer, double-layer water curtain plates and tri-layer water curtain plates for choice, with the frost catching rates of 95%-98%. In addition, it can take into consideration of requirements of the work pieces or buyers to provide the environmental requirements of dust-free clean painting of Grade 100,000, making the impact of solvent painting on operators lowest. There is no dust in the spraying room, even on the connection parts, so that it can comply with the environmental protection laws and rules of the local areas and countries of the buyers. 2) Dust-free painting system: Dust-free painting is for painting rooms, flash-off rooms and working pieces, even for the dust-free operation design of the whole line.