TREND AIRACE HALF MASK APF10 Five times larger surface area than the average disposable dust mask giving superior protection against dust inhalation & offering considerable cost savings Assigned Protection Factor 10 The one way exhaust valve vents to the underneathpreventing exhaled air from fogging goggles or the optional visor This also ensures that the filter stays dry reducing filter clogging & prolonging its life P2 electrostatic filter has Approx. life of ten times that of average disposable face mask Protects the user against hazardous toxic dust particles metal fumes & mist to classification P2 & down to 03 microns Conforms to standard BS EN 170 Respiratory protection to BS EN143 P2 We recommend a P3R filter for toxic woods such as hardwoods western red cedar & MDF