What does the so-called “Assigned Protection Factor (APF)” for respirators refer to?
According to the cited reference, “The 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 November 2016)
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