Citation

Zhu J, Wang L, He X, Lyu C, Zhang R, Jiang Q. China Saf. Sci. J. 2020; 30(12): 165-172.

Copyright

(Copyright © 2020, China Occupational Safety and Health Association, Publisher Gai Xue bao)

DOI

10.16265/j.cnki.issn1003-3033.2020.12.023

PMID

unavailable

Abstract

In order to investigate filtration efficiency, breathing resistance and quality factors of non-powered air-purifying N95 respirators which have been widely used against particulate matters, an analogue simulation system of respiratory protection against dust was established. With NaCl aerosol at 10-205 nm as testing medium, N95 and KN95 respirators were tested under constant flow mode and simulated human respiratory circulation flow mode between range of 15-85 L/ min. The results show that filtration efficiency of tested N95 and KN95 respirators is both higher than 95%. The most penetration particle size for respirators with electret fiber as filter material roughly falls between 40-60 nm. When at same test flow rate, particle penetration under circulation flow mode is significantly higher than that of constant flow. And along with increase of inhalation flow, particle penetration of respirators increase linearly, inhalation resistance shows parabolic increase, while quality factors decrease exponentially. © 2020 China Safety Science Journal. All rights reserved.

Language: zh