Feeke Five-layer Activated carbon PM2.5 filters and 6 Exhaust Valves Replacement, Active Carbon Filters for Mask (20)
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DURATION OF FILTERS AND VALVES
Duration time for filters depends on the pollution level and the frequency of usage. We recommend replacing the filter once a week if the mask is used extensively.
The valves should be replaced when they get damaged.
The package includes:
10/15/20/25/30/35 activated carbon
6x Exhaust Valves Replacement