Although this Code is written for nuclear power and nuclear fuel cycle facilities, the design requirements of these documents may be referenced for the design, fabrication, inspection, and testing of ventilation air cleaning and air conditioning equipment for other types of facilities. The user, however, is cautioned to carefully review these Code requirements for applicability to specific applications other than nuclear power and nuclear fuel cycle facilities. The user of the Code will note that metric equivalents of U.S. customary units appear throughout this issue of the Code. The values stated in U.S. customary units are to be regarded as the standard.