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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.


    DWGD-ZC Zero Clearance Grease Duct

    System features



    Zero Clearance and fire rated Grease Duct double wall system


    Wall thickness

    Inner Liner per UL-1978/-2221 Listing 
    Outer Jacket 0.025" (diameters 6 - 24 inch)
    Outer Jacket 0.035" (diameters 26 - 36 inch)

    Inner diameter

    5-36 inch


    3.25" thick compressed ceramic fiber 


    Vee band connection 

    Locking band

    Attached to each part


    Product data sheets and catalogs:

    Technical Data Sheet - DWGD-ZC

    Brochure Kitchen Exhaust GD Series



    Sample Specification – DWGD-ZC


    Submittal Records:

    GD Series Submittal Grease Duct

    UL Summaries:


    Main features

    • Leak proof high-pressure joints
    • Cut length available for maximum field flexibility
    • Smooth flow and known resistance for perfected factory pressure calculations
    • Zero clearance and 2-hour fire rated so it eliminates the requirements for an additional fire rated shaft


      Stainless steel and factory insulated zero clearance and fire rated duct assembly for Kitchen Ventilation Systems and Special Gas Vent. Eliminates the need for fire dampers in HVAC ducts, laundry, and fume venting applications. 

      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)


      90'' W.C.
      Pressure Listing for all Applications



      25 years warranty!