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Can a flexible duct connector be used to attach an exhaust duct to a utility set exhaust fan?

April 26, 2017connector duct exhaust fan flexible Used utility

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Can a flexible duct connector be used to attach an exhaust duct to a utility set exhaust fan?

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NFPA 96 states the following: 5-1.3 …The fan shall be connected to the exhaust duct by flanges securely bolted as shown in Figures 5-1.2(b), (c), (d), or (e) or by a system specifically listed for such use. Flexible connectors shall not be used.