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This document specifies the general requirements and the constructional and operating characteristics relating to safety, marking, and the associated test methods for gas heated commercial catering and bakery appliances. The specific requirements are given in Part 2. Requirements on materials and parts in contact with food and other sanitary aspects are given in Part 3. Only appliances of types A1, A2, A3, B1 and B2, as defined in Clause 4, are considered in this document. This document applies to all professional cooking and bakery appliances using gas for preparing food and drink. This document covers type tests only, and only the net calorific value (Hi) and net Wobbe number (Wi) are used. Annex C, informative, lists the main types of equipment entering into the field of application of this document.