Question: With regard to respirators used in the occupational setting, what is the so-called Assigned Protection Factor (APF)?
Answer: The Occupational Safety and Health Administration (OSHA) states “Assigned Protection Factor (APF) means the work-place level of respiratory protection that a respirator or class of respirators is expected to provide to employees when the employer implements a continuing, effective respiratory protection program as specified by [OSHA]” (https://www.osha.gov/Publications/3352-APF-respirators.pdf; accessed December 2017)
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