Respiratory protective devices - Open Access .click

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American Industrial Hygiene Association Journal, 1980
This paper describes a new respiratory protective device for use in dangerous environments. The new system provides a lightweight alternative to present compressed air systems and a safe alternative to present pure oxygen respirator systems. The new system utilizes electronically controlled valves, two breathing bags, and a small, compressed supply of ...
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Speech Transmission through Respiratory Protective Devices

American Industrial Hygiene Association Journal, 1961
Abstract The articulation index, or measure of the intelligibility of the spoken word, has been determined for 15 respiratory protective devices in common use. These values have significance in the ability to communicate when wearing respiratory protection.
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Respiratory protective devices. Human factors