This standard is intended for use in the design of life support equipment used for astronaut rescue, toxic propellant handling, fire rescue, emergency escape, and the performance of normal work while in a hazardous environment per 1.2. NOSH-approved equipment is exempt from the requirements of this standard.

NOTICE. When Government drawings, specifications, or other data are used for any purpose other than in connection with a definitely related Government procurement operation, the United States Government thereby incurs no responsibility nor any obligation whatsoever; and the fact that the Government may have formulated, furnished, or in any way supplied the said drawings, specifications or other data is not to be regarded by implication or otherwise as in any manner licensing the holder or any other person or corporation, or conveying any rights or permission to manufacture, use, or sell any patented invention that may in any way be related thereto.