OSHA Issues Additional Respirator Fit Testing Protocols to Provide More Flexibility for Employers

By Dan Deacon and Eric J. Conn

On September 26, 2019, OSHA issued a new Final Rule providing employers with new options for fit testing protocols to comply with OSHA respiratory protection requirements designed to protect workers from airborne contaminants.  More specifically, the new Rule, entitled “Additional Ambient Aerosol CNC Quantitative Fit Testing Protocols: Respiratory Protection Standard,” establish two additional methodologies for respiratory fit testing:

  1. a modified ambient aerosol condensation nuclei counter (CNC) quantitative fit testing protocol for full-facepiece and half-mask elastomeric respirators; and
  2. a modified ambient aerosol CNC quantitative fit testing protocol for filtering facepiece respirators.

The rule became effective September 26, 2019.

Both new protocols are abbreviated variations of the original OSHA-approved ambient aerosol CNC quantitative fit testing protocol (often referred to as the PortaCount protocol), and differ from the test by the exercise sets, exercise duration, and sampling sequence. The protocols serve as alternatives to the four existing quantitative fit testing protocols already listed in the Mandatory Appendix A of OSHA’s Respiratory Protection Standard:

  1. generated aerosol;
  2. ambient aerosol condensation nuclei counter (CNC);
  3. controlled negative pressure (CNP); and
  4. controlled negative pressure REDON.

The intent of the Rule is to Continue reading