" " Rectangular to Round Transitions - KB Duct - CECO Environmental


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Rectangular to Round Transitions

18 gauge. The taper is lapped spot welded and caulked. The 2.5” collar is applied as standard. Length varies based upon the various dimensions. However, REMEMBER, that length is not important in designing because of the adjustability of the system. IE the cut pipe can slide into the collar to adjust the length. Angle rings or flanges can be applied to the transitions and adapters to mate with existing duct, or they can be made with raw ends sized to specific dimensions.

Heavier gauges and full welded are available.

When using the adjustable feature of the fitting, order an additional O-ring.



  • Low Total Cost of Ownership
  • High reliability with custom manufactured designs to fit your application needs



  • Material integrity – Premium quality materials for even the most abrasive applications