What are the two main types of respirators?

The correct answer highlights the two primary classifications of respirators based on their function and the source of their breathing air. Air-purifying respirators are designed to filter out harmful particles, gases, or vapors from the air, providing clean air for the user to breathe. In contrast, air-supplied respirators deliver a continuous supply of clean air from an external source, which is essential in environments where the air is contaminated or lacks oxygen.

Understanding the difference between air-purifying and air-supplied is critical for selecting the appropriate respirator for specific work environments. This knowledge ensures workers are adequately protected from inhaling hazardous substances, enhancing their safety and health on the job site.