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603.4.1 Minimum Fasteners

Mechanical Code 2018 of Maryland > 6 Duct Systems > 603 Duct Construction and Installation > 603.4 Metallic Ducts > 603.4.1 Minimum Fasteners

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Round metallic ducts shall be mechanically fastened by means of not less than three sheet metal screws or rivets spaced equally around the joint.

Exception: Where a duct connection is made that is partially inaccessible, three screws or rivets shall be equally spaced on the exposed portion so as to prevent a hinge effect.

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603.4.1 Minimum Fasteners