SECAIR 3000.03 P3 R filters. - when combined with a two-filter half-mask or mask, protect the respiratory system against aerosols from solid particles (dust, fumes) and liquid (mists), provided that the concentration of the dispersed phase of the aerosol does not exceed 20 x PAC when combined with a half-mask and 1000 x PAC when combined with a mask. - small package contains 2 pcs. - meets the requirements of the standard: EN143