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NIOSH Conformity Assessment Letter to Manufacturers

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Subject: Issue Affecting Gas and Vapor Testing for NIOSH Respirator Approvals
This notice has been superseded. For the latest NIOSH guidance on this topic, please see the updated notice:
https://www.cdc.gov/niosh/npptl/resources/pressrel/letters/conformitymanuf/CA-2019-1015.html

NIOSH CA 2019-1014
March 2019

Issue Affecting Gas and Vapor Testing for NIOSH Respirator Approvals [PDF – 133 KB]