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All joints, longitudinal and transverse seams and connections shall be securely fastened and sealed with welds, gaskets, mastics (adhesives), mastic-lus-embedded-fabric systems or tapes. Tapes and mastics used with flexible air ducts and air connectors shall be listed and labeled in accordance with UL 181B. Duct connections to sheet metal fittings or flanges of air distribution system equipment and appliances shall be mechanically fastened.