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This filter is NIOSH approved, complying with all requirements of Federal Standard 42 CFR Part 84. Its approval number is the TC-84A-2530.
The useful life depends on the conditions of use and work, as for example the concentration of the pollutant, activity that is carried out, etc. The way to detect the end of the life of the filters against particles, is when the user notice difficulty in breathing. This indicates that the filter material has clogged and is impeding the normal passage of airflow into the respiratory system. In this case it is essential to replace the filters.