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This standard has been prepared to: - specify dimensions and tolerances for flexible ducts; - give methods for the performance testing of flexible ducts; - and enable assessment of minimum technical requirements. However because of the different types of flexible ducts and the various requirements in each application, some technical characteristics are presented as classes and may differ depending on the materials used. This standard can be used for the following applications: - testing of components during and after manufacturing; - attestation purposes. Temperature characteristics are supplied by the manufacturer.