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The TR1 Filters are electrostatically charged in order to attract, trap, and neutralize small particles. They are 98.6% effective agains PM2.5 particles and are effective down to 0.1 microns.
Filters typically last up to 40 hours in average conditions, but may need to be replaced sooner depending on the environment.
FINAL SALE ITEM - Due to the nature of face masks & related accessories, these products are not eligible for returns or exchanges.