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This cartridge is NIOSH approved, complying with all requirements of Federal Standard 42 CFR Part 84. Its approval number is the TC-23C-967.
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 chemical cartridges is perceiving the smell or flavor of the contaminant. In this case it is essential to replace the cartridges.