What best describes a supplied air respirator?

A supplied air respirator is specifically designed to deliver clean, breathable air to the user from a remote source, typically through a flexible hose. This type of respirator is essential in environments where the air may be contaminated or where there is insufficient oxygen available. The air source is often located in a safe area, allowing the user to operate in hazardous conditions without relying solely on the ambient air.

The distinction of a supplied air respirator from other types of respiratory protection lies in its operation; it does not filter surrounding air but instead supplies high-quality air from a different source. This is critical in settings where particulate matter, toxic gases, or low oxygen levels are present. In contrast, options that mention filtering air or being self-contained do not accurately represent the function and design of a supplied air respirator, as they either depend on environmental air or require on-board oxygen supplies.