55 Respiratory protection Kerbl respirators help to respond optimally to threats by pollutants and to protect yourself from them safely. All respirators are Category 3 Personal Protective Equipment (irreversible health damage) in accordance with EU Directive 2016/425. Breathing valves make them more comfortable. Code Description Example A organic gases and vapours Painting, tarring, herbicides B Inorganic gases and vapours, hydrogen sulphide, chlorine, hydrogen cyanide Detergents and disinfection agents E Sulphur dioxide, hydrogen chloride Exhaust gases K Ammonia Manure, stables P Dust Dust Activated carbon filter in half-masks for protection against gases and vapours The filter classes provide information on the maximum concentration of harmful gas in the air: Filter class Maximum protection 1 <1000 ppm (0,1vol%) 2 <5000 ppm (0,5vol%) 3 <10000 ppm (1,0vol%) The lifetime of filters depends on the humidity and temperature of the inhaled air, the chemical composition of the gases or the storage conditions. This means a general lifetime cannot be specified. Change the filter as soon as you notice the first unpleasant odours or inhaling becomes difficult as the filter has bonded together. Type Model Protection zones Application examples Hygiene mask 345103/10, 345103/50 no personal protective equipment coarse dust, liquid droplets and droplet-borne infection FFP1 34511/3 34511/10 34512/3 4-fold MAK value* Dust, pollen, rust, tile dust, aqueous aerosols FFP2 34695/10 34695/3 10-fold MAK value* Quartz, cement, flour and wood dust, metal smoke, fungal spores, aerosols, viruses, aqueous solutions of herbicides FFP3 34694/3 34694/10 30-fold MAK value* Stainless steel dust, asbestos, diesel soot, glass wool, viruses / bacteria P: filtering of noxious dusts, smoke, aerosols *MAK value = maximum workplace concentration. It indicates the maximum, permitted concentration of a material in the air for which no health damage can be expected, even when one is exposed to it for 8 hours a day, 40 hours a week.