The Assigned Protection Factor (APF) is used to determine what in respirator selection?

• A. The respirator level needed to meet exposure limits.
• B. The battery life of the respirator.
• C. The color code for hazard classification.
• D. The weight limit of the respirator.

Answer: (C)

APF tells you how much protection a respirator actually provides, and it’s the guide for choosing the right level of protection to meet exposure limits. In practice, you estimate the worksite contaminant concentration and compare it to the permissible exposure limit (PEL) to determine the required protection factor. You then select a respirator whose Assigned Protection Factor is at least that high, so the wearer’s inhaled concentration stays below the PEL when the respirator is properly fitted and used. The other aspects listed aren’t about the protective capability in terms of air quality—battery life, color coding, and weight limit don’t determine whether the exposure limit will be met.