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An Oxygen Mask is a face fitting mask, similar to a Respirator, used in environments where the atmosphere is not safe to breathe. Instead of filtering or compressing the outside atmosphere, the Oxygen mask attaches to Oxygen Tank sto supply the breathable air. Unlike an Oxygen Rebreather, the mask isn't designed to be used underwater or much above 1.5 atmospheres of pressure.
Oxygen Masks can also be used as Medical Equipment to support the breathing of patients with degraded oxygen uptake due to illness or injury.