Professional Filtration System? The gas mask with double filtration for professional personal protective, equipped with dual filter cartridges and electrostatic filter cotton double filtration. Multi-Scene Use? The Filter Cartridge can be used to prevent some solid and suspended particles. You can use them in a variety of workplace applications including petrochemical, chemical manufacturing, construction, transportation, facility sanitation, general manufacturing, industrial maintenance and more. How to Install? Put filter cotton on the filter box, Combine the filter box with a cover, Close them tightly. Aim two points of the filter box and the body of a face cover on a horizontal line, then loop them. Rotate the filter box clockwise to secure. The product has multiple protections in one step: it can effectively protect formaldehyde, dust, carbon disulfide, acetone and organic vapor. The trapezoidal design increases the filter area and keeps breathing smooth. Multi-layer activated carbon can be filtered repeatedly. The center of gravity swings back, which is not easy to cause neck fatigue and conforms to ergonomics. The rotating bayonet design makes the interface more firmly connected to the main mask, and the bayonet design makes it easier to replace accessories. We recommend that you change the filter cotton every eight hours of work. When you feel that the breathing resistance becomes larger, the filter cotton is dirty, and it is damaged, you need to replace the filter cotton in time. Our products are suitable for 6001cn, 5n11, 6100, 6200, 7502, 6800 face cover. 1 30PCS(15Pack) filter box.