These Scan Premier Valved Odour Disposable Masks have active carbon cover pre-filters, which protect lungs against organic vapour and gas below the Occupational Exposure Limits. Designed to cover the nose, mouth and chin. The construction is made of the filter material itself, and the exhalation valve allows for easy breathing. They are ideal for use with:- Brick dust- Concrete and plaster- Paint/varnish odours- Welding- Masonry and metalworking with power tools- Hand sanding- Wood and MDF (hand tools)- Loft insulation With a FPP2 protection level, these masks are suitable for protecting against particles of between 2-5 microns, such as fine dusts, fumes, aqueous mists and oil based mists. For a guide on protection levels, please see below. The masks have elasticated retaining straps to keep them securely in place. In addition they have an adjustable nose clip and soft foam nose piece for custom fitting. The non-irritating inner face piece ensures added comfort. To be disposed of after each period of work or 8 hour shift. The masks conform to EN149:2001 and A1:2009. Disposable Mask Protection Levels: FFP1: Particles larger than 5 microns. Dusts, Fumes, Aqueous mists, Oil based mists FFP2 Particles between 2 and 5 microns. Fine dusts, Fibres, Aqueous mists, Oil based mists FFP3 Particles less than 2 microns. Very fine dusts, Fibres, Aqueous mists, Oil based mistsEN149 Filtering Face Piece for Particulates.