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In case you missed it, OSHA has announced changes to their Respiratory Protection Standard. The changes affect the Ambient Aerosol Condensation Nuclei Counter (CNC) Quantitative Fit Test (QNFT) Protocols in 29 CFR 1910.134, Appendix A.

OSHA’S Modified CNC Fit Test Protocols

Coming Soon to the PortaCount Fit Tester

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These changes took effect on 26 September 2019 and include new modified rules for the following respirators:


  • Full-facepiece and half-mask elastomeric respirators
  • Filtering facepiece respirators


The modified CNC protocols enable fewer, shorter fit test exercises, reducing the the total fit test time to less than two and a half minutes. Like the original OSHA protocols, the new ones are compatible with the PortaCount Respirator Fit Testers, models 8030, 8038, 8040, and 8048.


Learn more here on TSI press release.


Update your PortaCount software here.


Alternatively, find out all you need to know in the FAQs.

More information

Want to discuss more about the change or to ask about an upgrade to the fastest fit test on the market, click on the button below or fill out the contact form.

TSI PortaCount

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