Assigned protection factor

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  1. The expected workplace level of respiratory protection that would be provided by a properly functioning respirator or a class of respirators to properly fitted and trained users. Abbrev. APF. ANSI
  2. The minimum anticipated protection provided by a properly functioning respirator or class of respirators to a given percentage of properly fitted and trained users. NIOSH
    Source: Dictionary of Mining, Mineral, and Related Terms


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