Tested and approved to EN 143 / EN 14387 standards with CE mark. Insert filters are connected to the mask by a filter adapter. The filter adapter is fitted with thread connector acc. to EN 148-1. Particle filters consist of a light PE housing with a built-in glas fibre filter. Special folding provides a large filter surface area in a confined space. A pre-filter collects aerosol mist and dust and prevents rapid accumulation of dirt particles in the main filter, thereby prolonging its lifespan. Easy to exchange by inserting into the outer chamber of the filter mount. Flame resistant.