This is another part of my recent respirator articles; my attempt to help up and coming program administrators understand what OSHA is actually requiring as the absolute minimums. This post is about the “numbers” we see and hear when discussing respiratory protection. As I posted a few months I ago, during an audit for a client we came across some emergency responders who had been fit tested using Quantitative Fit Testing (QNFT) for an SCBA and “passed” with a Fit Factor far less than 500. This was a serious error, but how many actually understand where the Fit Factor of 500 comes from for a Full Face Respirator? Well, here is what OSHA had to say about the Assigned Protection Factors, Fit Factors, and the “Safety Factor” when developing, implementing, and managing a respiratory protection program….