Abstract: A protective helmet also provides filtered air for respiration. A thin flat fan and motor assembly with motor and blades coplanar mounts in an aperture in the crown. A hard cover covers both fan and aperture. A resilient cushion spaces the helmet and ducts the filtered air over the forehead and beneath the visor to the nose and mouth. The air flow rate is so great that the visor and helmet need not be sealed to the face to prevent inhalation of unfiltered air. The fan-motor structure reduces the center of gravity for comfortable use.