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603.18 Vibration Isolation Connectors
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Vibration isolation connectors in duct systems shall be made of an approved flame-retardant fabric or shall consist of sleeve joints with packing of approved material, each having a maximum flame spread index/rating of 25 and a maximum smoke-developed rating of 50. The fabric shall have a maximum length of 10 inches (254 mm) in the direction of airflow.
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Vibration isolation connectors in duct systems shall be made of an approved flame-retardant fabric or shall consist of sleeve joints with packing ...
NYC Mechanical Code 2014 > 6 Duct Systems > 603 Duct Construction and Installation > 603.18 Vibration Isolation Connectors
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Article 6 Ventilation [PDF] (page 10)
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