Protects up to 10 x the MAK value. Protects against quartz, cement, flour and wood dust, metal smoke, fungal spores, aqueous solutions of herbicides. Exhalation valve reduces the exhalation resistance, allowing moisture and heat to disperse more easily. Complies with EN149. 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.