Together with the double filter half mask L120120S, you protect your airways from aerosols consisting of solid particles (dust, smoke) and liquid particles (mist), provided that the concentration of the dispersed phase does not exceed the following values: 4 x TLV L1201500, 10 x TLV L1201600, 30 x TLV L1201700. For use with filters L1201300, L1201400, and mask L120120S. Supplied in a set of 2 pieces. EN 143 standard.