What key feature does a supplied air respirator have?

A supplied air respirator is specifically designed to deliver clean, breathable air from a non-carried source through a hose directly to the user. This feature is crucial for protecting individuals working in environments where there are contaminants, such as gases, vapors, or particulates, ensuring that they have a constant supply of safe air. The non-carried source usually refers to a compressor or an air tank located at a distance, which allows for prolonged use without the risk of depleting an oxygen supply.

This design is especially vital in scenarios where the air quality is poor or hazardous and where the generated air supply must be safeguarded from immediate contaminants. As a result, this mechanism ensures that users can work safely in environments that may have been deemed unfit for breathing.

The characteristics of being lightweight and portable, built-in air purifiers, or being designed for short-term use do not accurately represent the primary function or advantages of a supplied air respirator. Rather, these elements could pertain to other types of respiratory protection equipment, which are designed for different contexts and applications.