This specification covers commercial microwave ovens. These ovens use ultrahigh frequency electromagnetic radiation in the approved industrial, scientific, and medical bands to defrost, heat, and cook food. LimitationsThis specification does not include all types, sizes, groups, styles, and classes of the commodities indicated by the titles of the specification, or that are commercially available, but is intended to cover the types, sizes, groups, styles, and classes that are suitable for general requirements. Oven Selection And Application Prior to the use of the classifications given in , the user agency should ensure they are not restricted by some aspect of the microwave oven design such as a weight or external dimension limitation that would prevent the unrestricted use of the classifications given in . Microwave Oven AvailabilityAlthough lists a wide range of sizes, classes, groups, and styles for commercial types of ovens, not all combinations are available. The values stated in inch-pound units are to be regarded as the standard. The SI units given in parentheses are for information only. The following precautionary caveat pertains to the test method portion only, Section , of this specification: This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.