Which respirator uses compressed air to provide breathable air?

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This question tests recognizing respirators that deliver breathable air from an external compressed-air source rather than filtering the surrounding air. A respirator that uses compressed air to provide breathable air is one where the user receives air from an external supply that is compressed, typically delivered through a hose from a compressor. This means the air is being supplied to the wearer, not merely filtered from the environment.

An N95 respirator, by contrast, is an air-purifying device that filters ambient air and does not provide a dedicated, compressed-air supply to the wearer. A self-contained breathing apparatus carries its own stored air in a cylinder on the user, which is breathable air but not supplied by an external compressor. It’s independent of a compressor-based supply, though it does provide air from a tank. The term “compressor air supplied” specifically points to air being delivered from an external compressed-air source, which is the defining trait of a supplied-air respirator.