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Nanoparticle filtration performance of filtering facepiece respirators and canister/cartridge filters.
J Occup Environ Hyg. 2013; 10(9):519-25.JO

Abstract

Respiratory protection offered by a particulate respirator is a function of the filter efficiency and face seal leakage. A previous study in our laboratory measured the filter penetration and total inward leakage (TIL) of 20-1000 nm size particles for N95 filtering facepiece respirators (FFRs) using a breathing manikin. The results showed relatively higher filter penetration and TIL value under different leak sizes and flow rates at the most penetrating particle size (MPPS), ∼45 nm for electrostatic FFRs,and ∼150 nm for the same FFRs after charge removal. This indicates an advantage of mechanical filters over electrostatic filters rated for similar filter efficiencies in providing respiratory protection in nanoparticle workplaces. To better understand the influence of the MPPS, the filtration performance of commonly used one N95 and one N100 FFR models, and four P100 canister/cartridge models were measured with monodisperse NaCl aerosols, and polydisperse NaCl aerosols employed in the National Institute for Occupational Safety and Health (NIOSH) certification test method. As expected, the polydisperse aerosol penetration was below 5% for the N95 FFR, and below 0.03% for the N100 FFR and P100 canister/cartridge filters. Monodisperse aerosol penetration results showed a MPPS of ∼40 nm for both the N95 and N100 FFRs. All four P100 canister/cartridge filters had a MPPS of ≥150 nm, similar to expectations for mechanical filters. The P100 canister/cartridge filters showed lower penetration values for different size nanoparticles than the N100 FFRs. The results indicate that a mechanical filter would offer a relatively higher filtration performance for nanoparticles than an electrostatic counterpart rated for the same filter efficiency. Overall, the results obtained in the study suggest that MPPS should be considered as a key factor in the development of respirator standards and recommendations for protection against nanoparticles.

Authors+Show Affiliations

National Personal Protective Technology Laboratory, National Institute for Occupational Safety and Health, Pittsburgh, PA 15236, USA. rda5@cdc.govNo affiliation info availableNo affiliation info available

Pub Type(s)

Evaluation Study
Journal Article
Research Support, U.S. Gov't, P.H.S.

Language

eng

PubMed ID

23927008

Citation

Rengasamy, Samy, et al. "Nanoparticle Filtration Performance of Filtering Facepiece Respirators and Canister/cartridge Filters." Journal of Occupational and Environmental Hygiene, vol. 10, no. 9, 2013, pp. 519-25.
Rengasamy S, BerryAnn R, Szalajda J. Nanoparticle filtration performance of filtering facepiece respirators and canister/cartridge filters. J Occup Environ Hyg. 2013;10(9):519-25.
Rengasamy, S., BerryAnn, R., & Szalajda, J. (2013). Nanoparticle filtration performance of filtering facepiece respirators and canister/cartridge filters. Journal of Occupational and Environmental Hygiene, 10(9), 519-25. https://doi.org/10.1080/15459624.2013.818229
Rengasamy S, BerryAnn R, Szalajda J. Nanoparticle Filtration Performance of Filtering Facepiece Respirators and Canister/cartridge Filters. J Occup Environ Hyg. 2013;10(9):519-25. PubMed PMID: 23927008.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Nanoparticle filtration performance of filtering facepiece respirators and canister/cartridge filters. AU - Rengasamy,Samy, AU - BerryAnn,Roland, AU - Szalajda,Jonathan, PY - 2013/8/10/entrez PY - 2013/8/10/pubmed PY - 2014/3/7/medline SP - 519 EP - 25 JF - Journal of occupational and environmental hygiene JO - J Occup Environ Hyg VL - 10 IS - 9 N2 - Respiratory protection offered by a particulate respirator is a function of the filter efficiency and face seal leakage. A previous study in our laboratory measured the filter penetration and total inward leakage (TIL) of 20-1000 nm size particles for N95 filtering facepiece respirators (FFRs) using a breathing manikin. The results showed relatively higher filter penetration and TIL value under different leak sizes and flow rates at the most penetrating particle size (MPPS), ∼45 nm for electrostatic FFRs,and ∼150 nm for the same FFRs after charge removal. This indicates an advantage of mechanical filters over electrostatic filters rated for similar filter efficiencies in providing respiratory protection in nanoparticle workplaces. To better understand the influence of the MPPS, the filtration performance of commonly used one N95 and one N100 FFR models, and four P100 canister/cartridge models were measured with monodisperse NaCl aerosols, and polydisperse NaCl aerosols employed in the National Institute for Occupational Safety and Health (NIOSH) certification test method. As expected, the polydisperse aerosol penetration was below 5% for the N95 FFR, and below 0.03% for the N100 FFR and P100 canister/cartridge filters. Monodisperse aerosol penetration results showed a MPPS of ∼40 nm for both the N95 and N100 FFRs. All four P100 canister/cartridge filters had a MPPS of ≥150 nm, similar to expectations for mechanical filters. The P100 canister/cartridge filters showed lower penetration values for different size nanoparticles than the N100 FFRs. The results indicate that a mechanical filter would offer a relatively higher filtration performance for nanoparticles than an electrostatic counterpart rated for the same filter efficiency. Overall, the results obtained in the study suggest that MPPS should be considered as a key factor in the development of respirator standards and recommendations for protection against nanoparticles. SN - 1545-9632 UR - https://www.unboundmedicine.com/medline/citation/23927008/Nanoparticle_filtration_performance_of_filtering_facepiece_respirators_and_canister/cartridge_filters_ L2 - http://www.tandfonline.com/doi/full/10.1080/15459624.2013.818229 DB - PRIME DP - Unbound Medicine ER -