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  • Master Flow 3-1/4 in. x 10 in. Rectangular Stack Duct Starting Collar
  • Master Flow 3-1/4 in. x 10 in. Rectangular Stack Duct Starting Collar
  • Master Flow 3-1/4 in. x 10 in. Rectangular Stack Duct Starting Collar

Master Flow 3-1/4 in. x 10 in. Rectangular Stack Duct Starting Collar

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This Master Flow 3-1/4 in. x 10 in. Rectangular Stack Duct Starting Collar is made of durable, galvanized steel. It is used to transition from plenums (duct board or lined) or a flat surface to 3.25 in. x 10 in. stack duct. It installs easily with sheet-metal screws.