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sleet_krkn [62]
3 years ago
13

The phase sequential mask is certified for use up to_____feet.

Biology
1 answer:
nexus9112 [7]3 years ago
7 0

Answer:

The correct answer is "40,000".

Explanation:

According to the Federal Aviation Administration, the phase sequential mask is certified for use up to 40,000 feet, because above this level the pressure will not allow the lungs to take enough oxygen. A specialized system such as pressure demand is necessary in order to fly to higher altitudes. These systems provide oxygen under positive pressure conditions.

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