These scan fpp3 premier valved disposable masks are designed to cover the nose mouth and chin the construction is made of the filter material itself and the exhalation valve makes breathing easier these masks have passed the optional dolomite clogging test giving the user better breathing resistance for longer they are ideal for use with toxic waste disposal casting metals smoke fumes paint and varnish fumes welding hand and power sanding of soft and hard wood and mdf dust masonry and con