Patent ID: 7044126

Claim:
A passive system for protecting the respiratory system of a user in which incoming atmospheric air is filtered prior to contacting the user and wherein contact with non filtered atmospheric air by the user is repressed, said system comprising: a manifold for supplying filtered air to a mouth-nose compartment and to a face compartment, the manifold defining a divided air passage whereby filtered air is divided and supplied directly to each of the mouth-nose compartment and the face compartment; an air passageway for passing air from the face compartment to said mouth-nose compartment; an air passageway for letting out air from said mouth-nose compartment into the ambient atmosphere; a hood compartment continuous with the rim of said face compartment and having an air-tight seal with the face at its anterior rim; an air-tight seal of said hood compartment with the neck of said user, and wherein said air passageways comprise unidirectional valves.