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A Supplied Air Respirator (SAR) is specifically designed for use in environments where there is a significant hazard from airborne contaminants or where the oxygen levels may be dangerously low. This includes waste sites or confined spaces, where the air may be contaminated with hazardous materials or where lack of oxygen could pose serious risks to health.

Confined spaces often have limited air circulation, making it challenging to ensure fresh air is available. In these scenarios, SARs allow firefighters and other responders to breathe safely by providing them with a continuous supply of clean air from a separate source. This is essential for maintaining safety while working in these high-risk environments, allowing personnel to perform their duties without the immediate risk of inhaling harmful substances or experiencing asphyxiation.

Other environments, such as open public spaces, high-rise buildings, or residential areas, may not present the same level of immediate danger that necessitates the use of such specialized respiratory equipment. In those cases, other types of respiratory protection or none at all may be sufficient, depending on the levels of contaminants and the nature of the operation being conducted.