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This cartridge is NIOSH approved, complying with all requirements of Federal Standard 42 CFR Part 84. Its approval number is TC-84A-4633.
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 useful life is to perceive the smell or taste of the contaminant in the case of the chemical cartridge, and / or when we detect resistance to breathing in the case of the filter against particles. Upon detecting any of these symptoms, the entire cartridge should be discarded.