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An orinasal mask, oro-nasal mask or oral-nasal mask [1] is a breathing mask that covers the mouth and the nose only. It may be a complete independent item, as an oxygen mask , or on some anaesthetic apparatuses, or it may be fitted as a component inside a fullface mask on underwater breathing apparatus , a gas mask or an industrial respirator ...
mouth-bit respirators, which fit in the mouth with the nose pinched shut (escape only) quarter-mask or orinasal mask, covering the mouth and nose only; half-mask, from below the eyes to below the chin; fullface mask, from above the eyes to below the chin; Some elastomeric masks include one-way valves to let exhaled air out unfiltered.
EN 402:2003 — Respiratory protective devices - Lung governed demand Self-contained open-circuit compressed air breathing apparatus with full face mask or mouthpiece assembly for escape. [10] ISO 23269-1:2008 — Ships and marine technology — Breathing apparatus for ships — Part 1: Emergency escape breathing devices (EEBD) for shipboard use.
The half-mask extends below the chin, and the full-face mask covers the eyes as well as the nose and mouth, and can have a dead space so large that an inner orinasal mask is provided to reduce the dead space. A diving half-mask used in scuba and freediving covers the eyes and nose, and is not breathing apparatus.
Brian Palmer further reported they were only capable of protecting the wearer's face from relatively small shrapnel fragments, and from the commonly used shot in shotgun shell intended to be used against birds, or small game. He particularly noted the masks would be useless against a 7.62×39mm bullet from a Kalashnikov rifle. Palmer also noted ...
An open circuit SCBA typically has three main components: a high-pressure gas storage cylinder, (e.g., 2,216 to 5,500 psi (15,280 to 37,920 kPa), about 150 to 374 atmospheres), a pressure regulator, and a respiratory interface, which may be a mouthpiece, half mask or full-face mask, assembled and mounted on a framed carrying harness. [70]
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