What is the pressure inside the face piece?

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Multiple Choice

What is the pressure inside the face piece?

Explanation:
The face piece is kept under positive pressure relative to the surrounding air. This means the air inside is slightly higher than ambient pressure, which helps push out any potential leaks and prevents contaminated outside air from seeping in. While atmospheric pressure is about 14.7 psi, the face piece is maintained just above that value to provide a protective, positive seal. It’s not exactly atmospheric, and it’s not zero or a vacuum.

The face piece is kept under positive pressure relative to the surrounding air. This means the air inside is slightly higher than ambient pressure, which helps push out any potential leaks and prevents contaminated outside air from seeping in. While atmospheric pressure is about 14.7 psi, the face piece is maintained just above that value to provide a protective, positive seal. It’s not exactly atmospheric, and it’s not zero or a vacuum.

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