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The integrated snorkel mask may be a half-mask, which encloses the eyes and nose but excludes the mouth, or a full-face snorkel mask, which covers the eyes, nose, and mouth. Early designs of snorkel-mask typically comprised a tube for breathing with an immersion-activated shut-off valve at the top, and the bottom opening into the mask, which ...
The 1950s US Divers "Marino" hybrid comprised a single snorkel mask with eye and nose coverage and a separate snorkel for the mouth. [4] Full-face snorkel masks use an integral snorkel with separate channels for intake and exhaled gases theoretically ensuring the user is always breathing untainted fresh air whatever the respiratory effort.
A diving mask (also half mask, dive mask or scuba mask) is an item of diving equipment that allows underwater divers, including scuba divers, free-divers, and snorkelers, to see clearly underwater. [ 1 ] [ 2 ] Surface supplied divers usually use a full face mask or diving helmet , but in some systems the half mask may be used. [ 2 ]
A diver in a pool wearing an AGA full face mask A diver wearing an Ocean Reef full face mask Head protection helmet for use with Ocean Reef full face diving mask. A full-face diving mask is a type of diving mask that seals the whole of the diver's face from the water and contains a mouthpiece, demand valve or constant flow gas supply that provides the diver with breathing gas. [1]
The diver wears a full-face mask or helmet, and gas may be supplied on demand or as a continuous free flow. More basic equipment that uses only an air hose is called an airline or hookah system. [52] [50] [53] This allows the diver to breathe using an air supply hose from a high pressure cylinder or diving air compressor at the surface ...
The volume of dead space is important for full-face masks and helmets, but not relevant to half masks as they are not part of the breathing passage. For breathhold diving, the mask internal volume must be equalised from the single breath in the diver's lungs, so a small volume is highly desirable, but scuba divers have sufficient air available ...
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