What type of respirator system provides a continuous supply of air from outside the hazard zone?

• A. Supplied-air respirator
• B. Self-contained breathing apparatus
• C. Air-purifying respirator
• D. Viral respirator

Answer: (A)

A respirator that provides a continuous supply of air from outside the hazard zone is the supplied-air respirator. It connects to an external air source—such as a compressor or air cylinder—through a hose, delivering breathing air to the wearer without relying on their own lungs or the surrounding atmosphere. This is essential in environments where the air is toxic or oxygen-deficient, requiring a steady, external air supply to stay safe. In contrast, a self-contained breathing apparatus carries its air supply on the wearer, a filter-type respirator draws in ambient air and filters it, and a viral respirator isn’t a standard category for continuous external air supply.