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Helps provide comfortable reliable worker protection against certain oil and non-oil based particles including those present with nuisance levels* of acid gases such as sulfur dioxide hydrogen fluoride and/or chlorine. An excellent choice for work settings that involve heat humidity and long wear periods. Suggested applications include glass etching chemical processing paper processing aluminum smelting and brewing operations. Lightweight construction promotes greater worker comfort and contributes to increased wear time. NIOSH 42 CFR 84 Approved. *3M recommended for relief against nuisance levels of acid gas. Nuisance level acid gas refers to concentrations less than the OSHA PEL or other applicable government exposure limits whichever is lower.