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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-RZ UL-2221 Zero Clearance & Fire Resistive Rectangular Grease Duct

    System features



    Zero Clearance and fire rated Grease Duct:
    Provides 2-hour fire resistive shaft and zero clearance duct in a rectangular assembly.


    Inner Material

    Stainless Steel


    Outer Jacket Material

    Choices of stainless steel or aluminized steel



    3'' of ceramic fiber insulation 


    Wall thickness

    Inner liner made of  0.035" stainless steel 

    - Dimensions of all sides totaling 24” or less = 0.025” thick

    - Dimensions of all sides totaling 26” or more = 0.035” thick



    Model DWGD-RZ Grease Duct is available in either square or rectangular configurations. The maximum allowable width to
    height ratio is 6 to 1, for instance 36” x 6”.
    Square duct is available in sizes from 6” x 6” to 36” x 36”. Rectangular duct is available in sizes from 6” x 8” to 27” x 48”.



    Inner connection is a flange-to-flange bolted connection
    Supplied sealant is used on the flange to create a seal
    Blanket insulation and outer band complete the joint assembly
    Rectangular grease duct must be installed with a slope of 1/8” per foot of horizontal run if the length of the run is 75’ or less. If the length of the horizontal run exceeds 75’, it must be installed at a slope of ½”


    Product data sheets and catalogs:

    Technical Data Sheet - DWGD-RZ


    Installation Manual:

    DWGD-RZ Installation manuals



    Submittal Records:

    GD Series Submittal Grease Duct

    UL Summaries:



    Main features

    • Extremely rigid inner is made of all-stainless steel with Limited Ten Year Warranty.
    • Liquid tight joints.
    • Smooth flow and known resistance for accurate factory pressure calculations.
    • Zero clearance and 2-hour fire resistive so it eliminates the requirements for an additional fire rated shaft.
    • Factory-built eliminates welding in the field.
    • Factory-insulated allows for single trade installation.
    • Rectangular configuration allows for alternative use of space in certain restrictive conditions.
    • May be intermixed with Jeremias round Models (GD, FL, or CK) or rectangular Model SWGD-R.


        Stainless steel, factory-insulated, zero clearance and fire resistive duct assembly for Kitchen Ventilation Systems.

        UL Listings (and ULC)

        UL-2221 (ULC S144) Standard
        Fire Resistive Grease Duct Enclosure Assemblies


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



        25 years warranty!