Masks are used as face parts in personal respiratory protective equipment filtering, designed to supply purified air to the respiratory organs and the removal of exhaled air, as well as to protect the eyes and face of a person from gases, vapours and/or aerosols of various harmful substances present in the air environment of the area of their use. Separately masks "BRIZ®-4306(EVR)" category 2 versions I and II can not be used, only as part of filtering PPE (together with filters).
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