This face mask is for use with the EDS Pulse Demand units. This would be a useful thing to bring if you plan to visit a wave flying site.
It is recommended that you switch from a cannula to a face mask if you intend to fly at or above 18,000 ft. AMSL.
A face mask like this will come standard in an EDS kit, but it is always useful to have a spare if you may be sharing your oxygen kit or flying for many days in a row.
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