Supplied Air Respirators (SARs) are devices designed to provide a constant supply of clean air from an uncontaminated source to the wearer. Unlike air-purifying respirators that filter contaminants from the air, SARs deliver breathable air through a hose connected to a stationary source, such as a compressed air tank or a centralized compressor system. These systems are crucial in environments where the airborne contaminants are too high for air-purifying respirators to handle effectively.