| 摘要 |
An air-impermeable hood having first and second substantially airtight seals adapted to encircle a portion of a wearer's body below the head, typically the neck. Continuously exhaled air from the wearer of the hood is channeled between the first and second seals pressurizing a space there between creating a continuously pressurized purge zone to the introduction of ambient air into the hood. When the pressure in the purge zone exceeds the resistance of the second seal, air taking the path of least resistance flows out of the second seal. The effect is that exhaled air from the wearer creates a pressurized barrier against ambient air yet also prevents the accumulation of excess carbon dioxide and moisture within the ocular area.
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