The National Institute for Occupational Safety and Health (NIOSH) recently extended the transition period for the respirator certification standard by means of a new final rule. The standards initially established in the 2012 final rule were originally designed to take effect over a three-year transition period, during which manufacturers were allowed to continue to manufacture, label, and sell respirators certified to the prior standards. The new rule allows NIOSH to extend the concluding date until one year after the agency approves a Closed-Circuit Escape Respirator (CCER) model.

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