Understanding Filtration Efficiency Testing and Fit Testing in Filtering Facepiece Respirators (FFRs)

September 2021
DHHS (NIOSH) Publication Number 2021-123
Cover page of Publication No. 2021-123, Understanding Filtration Efficiency Testing and  Fit Testing in Filtering Facepiece Respirators (FFRs)

This fact sheet describes filtration efficiency testing and the proper fit testing procedures for a filtering facepiece respirator (FFR), explaining why both are necessary for a respirator to perform as expected. A respirator user’s understanding of these procedures and how employers perform fit tests to minimize contaminant leakage into the respirator will enhance the user’s knowledge of how an FFR helps to protect respiratory health.

Understanding Filtration Efficiency Testing and Fit Testing in Filtering Facepiece Respirators (FFRs) (2021-123) pdf icon[PDF – 572 KB]

Suggested Citation

NIOSH [2021]. Understanding filtration efficiency testing and fit testing in filtering facepiece respirators (FFRs). By Schall J, Coffey C. Pittsburgh, PA: U.S. Department of Health and Human Services, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health. DHHS (NIOSH) Publication No. 2021-123 (revised 9/2021), https://doi.org/10.26616/NIOSHPUB2021123revised092021external icon

List of Revisions

Revision Date

Revisions

Citation of Revision

Revision Date

September, 2021 (original)

Revisions

Citation of Revision

NIOSH [2021]. Understanding filtration efficiency testing and fit testing in filtering facepiece respirators (FFRs). By Schall J, Coffey C. Pittsburgh, PA: U.S. Department of Health and Human Services, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health. DHHS (NIOSH) Publication No. 2021-123,  https://doi.org/10.26616/NIOSHPUB2021123external icon

Revision Date

September, 2021

Revisions

On page 1, there are references to three levels of filtration efficiencies for the nine filter classes of filtering facepiece respirators. The original references to filtration efficiencies incorrectly reported one percentage to be 99.7%. This percentage has been corrected to 99.97%.

Citation of Revision

NIOSH [2021]. Understanding filtration efficiency testing and fit testing in filtering facepiece respirators (FFRs). By Schall J, Coffey C. Pittsburgh, PA: U.S. Department of Health and Human Services, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health. DHHS (NIOSH) Publication No. 2021-123 (revised 9/2021), https://doi.org/10.26616/NIOSHPUB2021123revised092021external icon

Page last reviewed: September 20, 2021