Simulated Workplace Protection Factors for Half-Facepiece Respiratory Protective Devices

Details

• Personal Author:
  Coffey, Christopher C. ; Duling, Matthew G. ; Lawrence, Robert B. ; Slaven, James E.
• Description:
  This study investigates two different methods (random effects model and 5th percentile) for determining the performance of three types of respiratory protective devices (elastomeric N95 respirators, N95 filtering- facepiece respirators, and surgical masks) during a simulated workplace test. This study recalculated the protection level of three types of respiratory protective devices using the random effects model, compared the two methods with each other and the APF of 10 for half- facepiece respirators, and determined the value of each of the fit test protocols in attaining the desired level of simulated workplace protection factor (SWPF). Twenty- five test subjects with varying face sizes tested 15 models of elastomeric N95 respirators, 15 models of N95 filtering- facepiece respirators, and 6 models of surgical masks. Simulated workplace testing was conducted using a TSI PORTACOUNT Plus model 8020 and consisted of a series of seven exercises. Six simulated workplace tests were performed with redonning of the respirator/mask occurring between each test. Each of the six tests produced an SWPF. To determine the level of protection provided by the respiratory protective devices, a 90% lower confidence limit for the simulated workplace protection factor (SWPFlcl90%) and the 5th percentile of simulated workplace protection factor were computed. The 5th percentile method values could be up to seven times higher than the SWPFLCL90% values. Without fit testing, all half-facepiece N95 respirators had a 5th percentile of 4.6 and an SWPFlcl90% value of 2.7. N95 filtering-facepiece respirators as a class had values of 3.3 and 2.0, respectively, whereas N95 elastomeric respirators had values of 7.3 and 4.6, respectively. Surgical masks did not provide any protection, with values of 1.2 and 1.4, respectively. Passing either the Bitrex, saccharin, or Companion fit test resulted in the respirators providing the expected level of protection with 5th percentiles greater than or equal to 10 except when passing the Bitrex test with N95 filtering-facepiece respirators, which resulted in a 5th percentile of only 7.9. No substantial difference was seen between the three fit tests. All of the SWPFlcl90% values after passing a fit test were less than 10. The random model method provides a more conservative estimate of the protection provided by a respirator because it takes into account both between- and within-wearer variability. [Description provided by NIOSH]
• Subjects:
  Air Pollutants, Occupational Occupational Health Personal Protective Equipment Respiratory Protective Devices Respiratory System Safety Workplace
• Keywords:
  Air-purifiers Air-purifying-respirators Author Keywords: Fit Test Face-masks Mathematical-models N95 Elastomeric Respirators N95 Filtering-facepiece Respirators Personal-protection Personal-protective-equipment Protective-equipment Protective-measures Quantitative-analysis Respiration Respirators Respiratory-protection Respiratory-protective-equipment Simulated Workplace Test Work-environment Workplace-monitoring Workplace-studies

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• ISSN:
  1545-9624
• Document Type:
  Text
• Genre:
  Journal Article
• Place as Subject:
  OSHA Region 3 ; West Virginia
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  NPPTL - National Personal Protective Technology Laboratory ; DRDS - Division of Respiratory Disease Studies ; HELD - Health Effects Laboratory Division
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  420-431
• Volume:
  4
• Issue:
  6
• NIOSHTIC Number:
  nn:20032190
• Citation:
  J Occup Environ Hyg 2007 Jun; 4(6):420-431
• Contact Point Address:
  Matthew G. Duling, DHHS, PHS, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, Division of Respiratory Disease Studies, 1095 Willowdale Road, Morgantown, WV 26505-2888
• Email:
  mwd1@cdc.gov
• Federal Fiscal Year:
  2007
• Peer Reviewed:
  True
• Source Full Name:
  Journal of Occupational and Environmental Hygiene
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:255b4414c62acf03c78e59a887b6831a13b6852dcb1c3e0f0803be8a0681db8e68391391ba18053461fd88bd84b0bd48395b001550c0fddd25b69ca35144433e
• Download URL:
  https://stacks.cdc.gov/view/cdc/186230/cdc_186230_DS1.pdf
• File Type:
  [PDF - 276.36 KB ]