What is an APF number?

The APF number refers to the Assigned Protection Factor rating. This rating is crucial in occupational safety and health, particularly concerning respirators and protective equipment. It indicates the level of protection that a specific type of respirator or equipment can provide to the wearer in a hazardous environment.

Specifically, the APF quantifies the expected reduction in exposure to airborne contaminants: for instance, if a respirator has an APF of 10, it can be expected to reduce the concentration of a contaminant in the ambient air by a factor of 10 for the wearer, assuming proper fit and use. This measurement is vital for employers and safety professionals when selecting appropriate respiratory protection, ensuring that workers are safeguarded against potential health risks associated with hazardous substances in the workplace. Understanding APF ratings helps in compliance with safety regulations and maintaining a safe working environment.