Enter the measured airborne exposure and the occupational exposure limit to get the hazard ratio, the minimum required Assigned Protection Factor (APF), the OSHA Table-1 respirator classes that meet it, and the Maximum Use Concentration (MUC) — with IDLH and ceiling/STEL guard flags. Aligned to OSHA 29 CFR 1910.134. Exports a selection justification to Word.
⚠️ This calculator applies the respirator-selection logic of OSHA 29 CFR 1910.134 using the published Assigned Protection Factors (Table 1). It is a planning aid, not legal advice and not a substitute for a complete written respiratory protection program, a hazard assessment by a qualified person, fit testing and medical clearance. Air-purifying respirators must never be used in IDLH or oxygen-deficient atmospheres. Verify OELs, IDLH values and the current standard against authoritative sources (OSHA, NIOSH, the SDS, your competent person) before relying on any result.