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See Chinese contents: GB 2890-2022 GB 2890-2022: Respiratory protection -- Non-powered air-purifying gas mask
This document specifies the classification and sign, technical requirements, marking, packaging and information provided by the manufacturer of non-powered air-purifying gas masks; describes the test methods. This document applies to gas masks based on the non-powered air-purifying principle. This document does not apply to non-powered air-purifying gas masks, which are used in hypoxic environments, underwater operations, escape and firefighting hot zones.
