ABSTRACT
In order for a respirator equipped with a tight-fitting facepiece to provide adequate respiratory protection to its wearer while in a hazardous atmosphere, the facepiece must form a satisfactory seal that minimizes leakage of the hazardous atmosphere into the facepiece where it would be inhaled by the wearer. Since each individual's face varies in size and shape, the ability of the facepiece of a respirator to achieve a satisfactory fit on a particular worker's face must be determined by a fit test.
