McMaster-Carr logo
    Forward
    Enter e-mail addresses in the fields below
    Message
    Cancel
    Print
    How can we improve?
    Comments
    E-mail address (if you would like a response)
    57 Products

    Rectangular Duct and Fittings

    Image of System. Front orientation. Exploded view. Duct and Fittings. Rectangular Duct and Fittings.
    Maximize the space in close quarters, such as inside walls and ceilings. As rectangular duct sizes increase, they get wider but not taller. This shape is most often used for heating and cooling inside buildings. Components connect with brackets.
    Duct
    Image of Product. Front orientation. Duct and Fittings. Rectangular Duct and Fittings, Duct.
    Pair with compatible fittings and accessories.
    Galvanized Steel—Corrosion resistant and affordable, galvanized steel is the most commonly used ductwork material.
    Galvanized Steel
    Wd.
    Ht.
    Lg.,
    ft.
    Ga.
    Includes
    Each
    8"8"428Two Drive Brackets, Two S-Brackets0000000000000
    10"8"428Two Drive Brackets, Two S-Brackets000000000000
    12"8"428Two Drive Brackets, Two S-Brackets000000000000
    14"8"428Two Drive Brackets, Two S-Brackets000000000000
    16"8"426Two Drive Brackets, Two S-Brackets000000000000
    20"8"426Two Drive Brackets, Two S-Brackets0000000000000
    24"8"426Two Drive Brackets, Two S-Brackets0000000000000
     
    Brackets
    Image of Product. Front orientation. Duct and Fittings. Rectangular Duct and Fittings, Brackets, S-Bracket.

    S-Bracket

    Image of Product. Front orientation. Duct and Fittings. Rectangular Duct and Fittings, Brackets, Drive Bracket.

    Drive Bracket

    Securely connect rectangular duct and fittings. Brackets can be cut to length. Also known as cleats.
    Galvanized Steel—Corrosion resistant and affordable, galvanized steel is the most commonly used ductwork material.
    S-Bracket—Connect the long sides of duct.
    Drive Bracket— Connect the short sides of duct.
    Galvanized Steel
    Bracket
    Type
    Wd.
    Ht.
    Lg.,
    ft.
    Ga.
    Each
    S1 1/16"1/4"526000000000000
    Drive1 1/8"1/8"52600000000000
     
    90° Elbow Connectors
    Image of Product. Front orientation. Duct and Fittings. Rectangular Duct and Fittings, 90° Elbow Connectors, Horizontal Elbow.

    Horizontal Elbow

    Image of Product. Front orientation. Duct and Fittings. Rectangular Duct and Fittings, 90° Elbow Connectors, Vertical Elbow.

    Vertical Elbow

    Change the direction of airflow when joining lengths of duct.
    Galvanized Steel—Corrosion resistant and affordable, galvanized steel is the most commonly used ductwork material.
    Galvanized Steel
    Wd.
    Ht.
    Ga.
    Each
    Horizontal Elbow
    8"8"280000000000000
    10"8"28000000000000
    12"8"28000000000000
    14"8"28000000000000
    16"8"26000000000000
    20"8"26000000000000
    24"8"26000000000000
     
    Vertical Elbow
    8"8"28000000000000
    10"8"28000000000000
    12"8"28000000000000
    14"8"28000000000000
    16"8"26000000000000
    20"8"26000000000000
    24"8"26000000000000
     
    45° Elbow Connectors
    Image of Product. Front orientation. Duct and Fittings. Rectangular Duct and Fittings, 45° Elbow Connectors, Horizontal Elbow.

    Horizontal Elbow

    Image of Product. Front orientation. Duct and Fittings. Rectangular Duct and Fittings, 45° Elbow Connectors, Vertical Elbow.

    Vertical Elbow

    Change the direction of airflow when joining lengths of duct.
    Galvanized Steel—Corrosion resistant and affordable, galvanized steel is the most commonly used ductwork material.
    Galvanized Steel
    Wd.
    Ht.
    Ga.
    Each
    Horizontal Elbow
    8"8"280000000000000
    10"8"28000000000000
    12"8"28000000000000
    14"8"28000000000000
     
    Vertical Elbow
    8"8"28000000000000
    10"8"28000000000000
    12"8"28000000000000
    14"8"28000000000000
     
    Straight Reducers
    Image of ProductInUse. Shown Installed. Front orientation. Duct and Fittings. Rectangular Duct and Fittings, Straight Reducers.

    Shown Installed

    Image of Product. Front orientation. Duct and Fittings. Rectangular Duct and Fittings, Straight Reducers.
    Transition between ducts of different sizes. These reducers decrease duct width by 2". Cut a hole in the smaller duct to fit the reducer and secure it with tapping screws.
    Galvanized Steel—Corrosion resistant and affordable, galvanized steel is the most commonly used ductwork material.
    Galvanized Steel
    Wd.
    Ht.
    Ga.
    Each
    2"8"280000000000000
     
    Straight Collars
    Image of Product. Front orientation. Duct and Fittings. Rectangular Duct and Fittings, Straight Collars.
    Add a branch to an existing line of rectangular duct. Cut a hole in the duct, attach the collar by bending the tabs, and connect another piece of duct.
    Galvanized Steel—Corrosion resistant and affordable, galvanized steel is the most commonly used ductwork material.
    Galvanized Steel
    Wd.
    Ht.
    Ga.
    Each
    8"8"280000000000000
    10"8"28000000000000
    12"8"28000000000000
    14"8"28000000000000
    16"8"26000000000000
    24"8"26000000000000
     
    End Caps
    Image of Product. Front orientation. Duct and Fittings. Rectangular Duct and Fittings, End Caps.
    Cover unused duct openings to prevent air leaks. End caps are often used to seal duct after changes to your system or equipment. To make modifications or expand your line, remove the cap.
    Galvanized Steel—Corrosion resistant and affordable, galvanized steel is the most commonly used ductwork material.
    Galvanized Steel
    Wd.
    Ht.
    Ga.
    Each
    8"8"28000000000000
    10"8"2800000000000
    12"8"28000000000000
    14"8"28000000000000
    16"8"26000000000000
    20"8"26000000000000
    24"8"26000000000000
     
    Duct Turning Vanes
    Image of ProductInUse. Shown Cut and Assembled. Front orientation. Contains Annotated. Duct Turning Vanes.

    Shown Cut and Assembled

    Turning Vanes—Guide air smoothly around sharp bends. These turning vanes improve airflow efficiency by reducing turbulence and pressure loss. Cut vanes to size and pair with rails. Mount assembled vanes inside duct using tapping screws.
    Turning Vane Rails—Mounting tabs hold vanes in place. Cut rails to length.
    Galvanized Steel
    Wd.
    Ht.
    Lg.,
    ft.
    Rail Mounting
    Tab Spacing
    Ga.
    Each
    Turning Vanes
    2 7/8"1"6—26000000000000
    5 5/8"1 7/8"6—2400000000000
     
    Turning Vane Rails
    4 1/2"—62 1/2"2400000000000
    7 3/8"—63 1/4"2400000000000
     

    Turning Vanes for Rectangular Duct

    Image of ProductInUse. Shown Cut and Assembled. Front orientation. Contains Annotated. Duct Turning Vanes. Turning Vanes for Rectangular Duct.

    Shown Cut and Assembled

    Image of Product. Front orientation. Duct Turning Vanes. Turning Vanes for Rectangular Duct, Turning Vanes.

    Turning Vanes

    Image of Product. Front orientation. Duct Turning Vanes. Turning Vanes for Rectangular Duct, Turning Vane Rails.

    Turning Vane Rails

    Guide air smoothly around sharp bends in rectangular duct. Turning vanes improve airflow efficiency by reducing turbulence and pressure loss. To assemble, cut vanes and rails to size. Rails have mounting tabs to hold vanes. Mount inside duct using tapping screws (not included).
    Galvanized Steel—Corrosion resistant and affordable, galvanized steel is the most commonly used ductwork material.
    Galvanized Steel
    Wd.
    Ht.
    Lg.,
    ft.
    Rail Mounting
    Tab Spacing
    Ga.
    Each
    Turning Vanes
    2 7/8"1"6—26000000000000
    5 5/8"1 7/8"6—2400000000000
     
    Turning Vane Rails
    4 1/2"—62 1/2"2400000000000
    7 3/8"—63 1/4"2400000000000
     

    Duct Fire Dampers

    In case of a fire, these dampers shut automatically to stop airflow. They have a fusible link that melts at 165° F, releasing a spring to close the blade. Dampers meet UL 555 fire safety standards to help prevent the spread of fire for 11/2 hours. They are undersized to fit inside duct.
    For Square Duct
    Image of Product. Front orientation. Duct Fire Dampers. For Square Duct.
    Galvanized Steel—Strong and corrosion resistant, galvanized steel is the most commonly used ductwork material.
    For
    Duct
    Overall
    Galvanized Steel
    Ht.
    Wd.
    Ht.
    Wd.
    Dp.
    Fire Safety
    Std.
    Fusible Link
    Melting Temp., ° F
    Ga.
    Each
    8"8"7 3/4"7 3/4"4 7/8"UL 555
    		165220000000000000
    12"12"11 3/4"11 3/4"4 7/8"UL 555
    		16522000000000000
    14"14"13 3/4"13 3/4"4 7/8"UL 555
    		16522000000000000
    18"18"17 3/4"17 3/4"4 7/8"UL 555
    		165220000000000000
    24"24"23 3/4"23 3/4"4 7/8"UL 555
    		165220000000000000
    Fusible Links
    Each
    Replacement Fusible Link with 165° F Melting Temperature0000000000000
    Fusible Link with 212° F Melting Temperature 000000000000
    Fusible Link with 386° F Melting Temperature 0000000000000
    back to top