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A half-mask is a mask that covers half the face. It may mean: a mask covering from below the eyes to below the chin a dust mask; a filtering facepiece respirator; an elastomeric respirator; a mask covering the eyes and perhaps the forehead and/or nose, but not the mouth. a half-face diving mask
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. This reduces the resistance when the user is breathing out, and some find it makes the mask more comfortable. [2] It may also reduce inwards leakage. [10 ...
Shirohige Ressei-menpo. 18th century, Edo period. Tokyo Fuji Art Museum.. Men-yoroi (面鎧), also called menpō (面頬) or mengu (面具), [1] [2] [3] are various types of facial armour that were worn by the samurai class and their retainers in feudal Japan.
half-mask A half mask is a facepiece covering the mouth and nose and extending over the chin. hazardous materials Hazardous materials are materials that pose a risk to health, safety, property or the environment by their presence. hazmat environment An environment which is immediately dangerous to life or health due to the presence of hazardous ...
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.
Filtering facepieces are typically simple, light, single-piece, half-face masks and employ the first three mechanical filter mechanisms in the list above to remove particulates from the air stream. The most common of these is the white, disposable standard N95 variety; another type is the Surgical N95 mask.
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