Evaluation of Surgical N95 Respirators Covered with Combinations of Masks and Face Shield

Details

• Personal Author:
  Powell JB ; Quinn T ; Simons J ; Walbert G
• Description:
  Objective: The aim of the study is to evaluate the metabolic demands and internal breathing environments when covering an N95 with a surgical mask, cloth mask, and/or FS. Methods: Three N95 models approved by the National Institute for Occupational Safety and Health were evaluated under six covering conditions using the National Institute for Occupational Safety and Health Automated Breathing and Metabolic Simulator. All conditions used one trial with each N95 for six incremental 5-minute work rates. Inhaled oxygen and carbon dioxide concentrations, peak inhaled and exhaled pressures, and inhaled wet-bulb and dry-bulb temperatures were measured continuously and averaged across all work rates and covering conditions. Conclusions: Results suggest that metabolic demands and internal breathing environments are significantly impacted by all combinations of coverings tested when compared to N95 only. [Description provided by NIOSH]
• Subjects:
  Communicable Diseases Energy Metabolism Occupational Health Personal Protective Equipment Respiratory Protective Devices Respiratory System Safety
• Keywords:
  Author Keywords: N95 Breathing Covering Face Shields Healthcare Worker Infection Prevention Infectious Diseases Metabolic Effects N95 Filtering Facepiece Respirators Physiological Effects Surgical Masks

  More +
• ISSN:
  1076-2752
• Document Type:
  Text
• Genre:
  Journal Article
• Place as Subject:
  OSHA Region 3 ; Pennsylvania ; West Virginia
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  NPPTL - National Personal Protective Technology Laboratory
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Volume:
  65
• Issue:
  7
• NIOSHTIC Number:
  nn:20067349
• Citation:
  J Occup Environ Med 2023 Jul; 65(7):610-614
• Contact Point Address:
  Jeffrey B Powell, National Personal Protective Technology Laboratory, 626 Cochrans Mill Rd, Pittsburgh, PA 15236
• Email:
  efe8@cdc.gov
• Federal Fiscal Year:
  2023
• Peer Reviewed:
  True
• Source Full Name:
  Journal of Occupational and Environmental Medicine
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:0e07a7aa699b75e9f62dd799f279459398e79f5a39751a0a66bcb226a5c10ed993aec7e27872a45e4300e46ffa51529dbb13a5993643e2ba71e98d9ab82793b5
• Download URL:
  https://stacks.cdc.gov/view/cdc/231423/cdc_231423_DS1.pdf
• File Type:
  [PDF - 446.22 KB ]