These scan fpp1 premier valved disposable masks are designed to cover the nose mouth and chin the construction is made of the filter material itself and the valve makes breathing easier they are ideal for use with brick dust concrete and plaster hand sanding loft insulation with a fpp1 protection level these masks are suitable for protecting against particles bigger than 5 microns such as dusts fumes aqueous mists and oil based mists for a guide on protection levels please see below the mask