Which respirator type is NOT air-supplying?

An air-purifying respirator is designed to filter out contaminants from the air, making it an effective option for environments where the air is not oxygen-deficient and the contaminants can be removed. Unlike air-supplying respirators, such as self-contained breathing apparatus (SCBA) and supplied-air respirators, air-purifying respirators do not provide a supply of clean air; instead, they rely on existing air to pass through filters that remove harmful substances like dust, fumes, or vapors.

Self-contained breathing apparatus (SCBA) and supplied-air respirators supply breathable air from a source independent of the atmosphere. SCBAs carry their own air supply and are often used in situations where there is no breathable air available, while supplied-air respirators draw air from a remote source and deliver it via a hose to the user.

In contrast, powered particulate respirators, although often mistaken as air-supplying because they utilize a fan to circulate air, still don't supply air from an independent source; they simply aid in filtering and providing a comfortable flow of air through the filters.

Thus, the air-purifying respirator is unique as it does not supply fresh air but relies on the atmosphere around the user, making it the