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This model of mask has an ergonomic 3D design to fit most face shapes with a Polystyrene exhalation valve with rubber diaphragm. It has a high efficiency (99% minimum) filtering with exhale valve and fully adjustable 4-point harness and offers an assigned protection factor (APF) of 20x workplace exposure limit (WEL) for fine non-toxic dusts, fibres, fumes and mists. The mask has extremely low breathing resistance due to the design and protective shield.