What are the three basic types of respirators?

The three basic types of respirators are categorized based on their function and the method by which they provide breathable air. Air Purifying respirators filter out contaminating substances from the air, allowing the user to breathe clean air. Self Contained Breathing Apparatus (SCBA) are devices where the user carries a supply of breathable air onboard, providing protection independent of the surrounding atmosphere, which is crucial in environments that are immediately dangerous to life or health. Supplied air respirators deliver air directly from a clean air source to the user, ensuring a constant supply of safe air.

This understanding of the respirators highlights why the first choice accurately reflects the basic types of respirators used in various scenarios, ensuring the safety of personnel in hazardous environments.