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Flanged Ducting | Vantstone Duct Flange | Flange Ductwork


KB Duct Flanged Ducting | Vantstone Duct Flange | Flange Ductwork
Flanged Ducting | Vantstone Flanged Duct | Flange Ductwork

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Vanstone Flanged Duct

Our KB Duct brand offers duct with and without flanges (angle rings) in black iron, galvanized or stainless steel, and with or without holes. We can manufacture flanged duct from 3” all the way up to the size you could drive a truck through, and we can manufacture lighter gauges to full welded product in heavy gauge (even up to 1/4"), all depending upon the application.

The term Vanstone flanged duct refers to a technique where flanges are placed onto the pipe, with the lip turned back at 90 degrees and left loose for a secure metal-to-metal connection when the flanges are pulled together and the Vanstone lips are connected. This allows for easy alignment of the centerline of the components.



  • Low Total Cost of Ownership
  • High reliability with custom manufactured flanged ducts to fit your application needs starting at 3"



  • Material integrity – Premium quality materials for even the most abrasive applications
  • Flanged duct is available in lengths up to 20' depending on diameter
    • 16-gauge and heavier, seam welded
    • 25" diameter and above are seam welded
    • Lock seamed available in 5' lengths only
  • Standard flanges are galvanized. Available also in stainless stell or black iron
  • Available in heavier gauges and larger sizes