When the oxygen level falls below which percentage should air supplied respirators be used?

Air supplied respirators should be used when the oxygen level falls below 19.5%. This threshold is established by safety standards to ensure worker protection in environments where the oxygen level is insufficient for safe breathing. Oxygen levels below this percentage can lead to symptoms of hypoxia, which includes confusion, shortness of breath, and loss of consciousness.

The use of air supplied respirators in such situations provides a continuous supply of breathable air, ensuring that workers remain safe and capable of performing their tasks without the risk of suffocation or respiratory distress. This safety regulation is crucial in various industries, including construction and manufacturing, where confined spaces may have variable oxygen levels due to factors such as ventilation or the presence of other gases. Adhering to this rule is essential for the safety and health of workers in potentially hazardous environments.