A pressure demand apparatus designed to maintain a slight positive pressure of air inside the facepiece during inhalation and exhalation. Positive-pressure helps prevent contaminants from entering the facepiece, should there be small breaks in the face-to-facepiece seal. MSA's AirHawk MMR air mask, incorporates SCBA technologies available for industrial, agricultural, wastewater, hazmat and HVAC work. Offers lightweight, durability and comfort in an economical package. Designed with the user in mind, the AirHawk SCBA will go with you in the many applications that do not require NFPA-1981 compliance. In addition, the AirHawk is available in both low-and high-pressure versions.