Assigned Protection Factors (APF) Explained: OSHA Respirator Selection — Complete Guide for Industrial Hygienists and Safety Managers | WC Safety
Assigned protection factors (APF) are the protection levels OSHA assigns to each respirator class in 29 CFR 1910.134 Table 1. This guide decodes the APF table from quarter mask to pressure-demand SCBA, shows how APF and the exposure limit set the maximum use concentration, and works an example of picking a respirator from a measured exposure.
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