환경에 의해 제한된 필터 마스크

The use of filter-type respiratory protective equipment must be limited by the environment. When there are harmful substances in the environment that cannot be filtered by the filter material, or the oxygen content is less than 18%, or the concentration of toxic and hazardous substances is high (>1% ), 사용 시 이 환경에서 격리된 호흡기 보호 장비를 사용해야 합니다.