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    Double wall stainless steel exhaust systems

    Chimneys made of stainless steel with high quality insulation material, available in different designs, materials and colors.


    Zero Clearance Grease Duct

    System features



    Double Wall Commercial Kitchen Exhaust



    Inner and outer jacket are stainless steelAll supports and accessories are stainless steel


    Wall thickness

    Outer Jacket is 0.035” thick for all diameters

    Inner diameter

    6-36 inch
    (use Model DWFL-ZC for diameters 38” through 48”)


    3 ¼” thick high-density ceramic fiber insulation


    2.2” overlapping joint with Patent-Pending light weight technology and a double female socket permitting fastest alignment/installation on the market

    Locking band

    Attached to each part


    Product data sheets and catalogs:

    Technical Data Sheet - DWCK-ZC

    Brochure Kitchen Exhaust Systems


    Installation Manual:

    Installation CK Systems – All


    Submittal Records:

    DWCK-ZC Submittal Record


    UL Summaries:


    Main features

    • All-in-one grease duct and 2-hour fire rated shaft/enclosure assembly
    • Only 1/16 inch per foot slope is required
    • Factory CAD designs for installation ease
    • All lengths are field cutable for maximum flexibility
    • 100% stainless steel with Limited Lifetime Warranty
    • Smooth flow and known resistance for perfected factory pressure calculations


      • Stainless Steel Duct for connecting cooking appliances and kitchen hoods to the outdoors under negative or positive pressure
      • Design eliminates welding, second insulation trade, third trade for a fire-rated shaft, and all the lengthy inspections in the field
      • Provides UL/ULC Listed and Certified all-in-one exhaust solutions
      UL Listings (and ULC)

      UL-2221 Standard
      Fire Resistive Grease Duct Enclosure Assemblies


      UL-1978 Standard
      Grease Duct
      (ULC-S662 Standard for Factory-Built Grease Duct)


      Additional UL/ULC 20" W.C. Pressure Listing

      25 years warranty!