Abstract: A respiratory protection apparatus has a face body, and a right side and a left side of a vertical centerline of the body are respectively provided with filtering devices each of which houses an electrical fan unit therein. Without narrowing the field of the front vision, without increasing the front side weight, and without deteriorating the work efficiency and comfortable fitting, the apparatus ensures the air flow rate of more than 120 liters per minute. Moreover, the electrical fan unit may be detachable from the face body, so that the face body is easily washed and parts are readily replaced with new ones.

Abstract: A respiratory protection apparatus has a face body, and a right side and a left side of a vertical centerline of the body are respectively provided with filtering devices each of which houses an electrical fan unit therein. Without narrowing the field of the front vision, without increasing the front side weight, and without deteriorating the work efficiency and comfortable fitting, the apparatus ensures the air flow rate of more than 120 liters per minute. Moreover, the electrical fan unit may be detachable from the face body, so that the face body is easily washed and parts are readily replaced with new ones.

Abstract: A length adjusting device for fastening straps of a mask includes an oblong elastic thin plate with a plurality of stepped hook portions. One strap of fastening straps of the mask is to be detachably fitted at a base end portion of the elastic thin plate and another strap of the mask is to be engageably fitted on the stepped hook portions. The elastic thin plate may have a piercing hole at its base end portion, into which the strap of the mask is to be detachably fitted, and/or have opposing hook portions which opposingly project from both its upper and lower sides and incline toward the base end of the elastic thin plate. The piercing hole may have a cut and the cut may extend slantingly toward a tip side of the elastic thin plate.