Forced ventilation filtration device

Claim 1

A compact, integral forced-ventilation personal respirator device comprising: means defining a closed personal breathing space to be protected; a housing including connector means for air-tight connection of said housing to said closed space to be protected; an electric blower removably attachable to said housing and comprised of an electric motor stationary relative to said housing in the attached state of said blower and a bladed centrifugal-type rotor fixedly mounted on the output shaft of said motor; and at least one at least partly annular compartment inside said housing for accommodating at least one filter medium of at least partly annular configuration located downstream of said blower, both said electric motor and the rotor of said blower being disposed within a space inside of said partly annular filter medium, at least a portion of the blading of said rotor being substantially coplanar with said filter medium, said compartment providing access of the output air from said blower to said filter medium and egress of filtered air from said filter medium to a space communicating with said connector means of said housing, whereby ambient air is drawn into said housing by said blower and forced thereby via said at least one filter medium and said connector means into said closed space to be protected.