Air purifying respirator for user's having a face shield configured to shield the user's face from splatter, a head strap configured to encircle at least a portion of the users head, said head strap configured to support the face shield, at least one fan, and a fan housing positioned proximate an upper edge of the face shield, said fan housing configured to support said fan, a filter media positioned on an outer perimeter flange of the fan housing to maximizing a surface area of said filter media, a face shroud connected to a perimeter of the face shield, the face shroud configured to provide a seal between the face shield and the user's face and thus, to facilitate pulling the air through the filter media, and the fan pushes the filtered air from said fan housing to the user between said face shield and the user's face.

A helmet-based respiratory assistance device is disclosed. The device comprises a hood body with an open end, dimensioned to house a user's head therein, an inflow port and an outflow port flowingly connected to the hood body, and an anti-asphyxiation valve arranged in one of the inflow port and the outflow port. In some embodiments an access port is arranged on the hood body. The access port may comprise a first sealing layer and a second sealing layer attachable to the first sealing layer. The first and second sealing layers are arranged to allow rapid access to the user when the user's head is housed within the hood body.