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Surgical masks cannot filter out free nanoparticles The certification test for N95 respirators is performed following worst case scenarios including storage at 85% relative humidity and
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The N95 respirator is the most common of the seven types of particulate filtering facepiece respirators. This product filters at least 95% of airborne particles but is not resistant to oil. This web page provides a table of NIOSH approved N95 respirators, listed alphabetically by manufacturer.
An approved N95 mask filters out at least 95% of particulates larger than 0.3 microns in diameter. Avoid buying masks without proper NIOSH certification. When shopping for N95 masks, it is important to remember that N95 is an industrial rating, not a design standard.
Keywordsrespirator, filter, total inward leakage, breathing frequency, particle size The present study is a follow up to our recent effort in which the effect of breathing frequency on the performance of an N95 FFR and SM was examined particle size independently (He et al. 2013c). The experimental