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)
    34 Products

    Standard Duct and Fittings

    Image of System. Front orientation. Exploded view. Duct and Fittings. Standard Duct and Fittings.
    Deliver air for a range of HVAC applications, including exhaust and dust collection. Our basic duct, the round shape creates smoother, more efficient airflow than rectangular and oval duct. The male end is slightly smaller than the female, so sections join without clamps or tools.
    Vent Caps
    Image of Product. Front orientation. Duct and Fittings. Standard Duct and Fittings, Vent Caps, Exhaust Vent.
    Image of Product. Front orientation. Duct and Fittings. Standard Duct and Fittings, Vent Caps, Intake Vent.

    Exhaust Vent

    Intake Vent

    Cover vents with caps that let air in or out.
    Exhaust Vent—A built-in damper allows air to escape while blocking backdrafts, rain, and snow.
    Intake Vent—Only fresh air enters though the screen—no debris or pests allowed.
    Galvanized Steel—Corrosion resistant and affordable, galvanized steel is the most commonly used ductwork material.
    Lightweight Aluminum—One-third the weight of steel, aluminum ductwork is easier to handle during installation. Like galvanized steel, it resists rust in wet environments but won’t last as long.
    Galvanized Steel
    Lightweight
    Aluminum
    Duct
    Size
    ID
    OD
    Ga.
    Features
    Includes
    Each
    Each
    Exhaust Vent
    66"—30—Backdraft Damper1766K492000000———0
    66"—22—Backdraft Damper———01773K63000000
     
    Intake Vent
    6—5 7/8"30Bird Screen—1766K49700000———0
     
    Rain Caps
    Image of Product. Front orientation. Duct and Fittings. Standard Duct and Fittings, Rain Caps.
    Top off vertical duct and exhaust stacks to prevent corrosion and blockages that can disrupt airflow.
    Galvanized Steel—Corrosion resistant and affordable, galvanized steel is the most commonly used ductwork material.
    Corrosion-Resistant 304 Stainless Steel—The most corrosion-resistant metal duct we sell. It won’t rust or degrade in systems that exhaust chemical fumes or vent heat from industrial ovens and dryers.
    Galvanized Steel
    Corrosion-Resistant
    304 Stainless Steel
    Duct
    Size
    ID
    Ga.
    Each
    Each
    66"261766K740000001767K34000000
     
    End Caps
    Image of Product. Front orientation. Duct and Fittings. Standard Duct and Fittings, End Caps, Male.

    Male

    Image of Product. Front orientation. Duct and Fittings. Standard Duct and Fittings, End Caps, Female.

    Female

    Cover unused duct openings to prevent air from leaking, dust from escaping, and debris from entering. 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.
    Corrosion-Resistant 304 Stainless Steel—The most corrosion-resistant metal duct we sell. It won’t rust or degrade in systems that exhaust chemical fumes or vent heat from industrial ovens and dryers.
    Galvanized Steel
    Corrosion-Resistant
    304 Stainless Steel
    Duct
    Size
    ID
    OD
    Ga.
    Each
    Each
    Male
    6—5 7/8"2617135K8300000———0
     
    Female
    66"—2617135K9300001767K64000000
     

    Tight-Seal Spiral Duct and Fittings

    Image of System. Front orientation. Contains MultipleImages. Duct and Fittings. Tight-Seal Spiral Duct and Fittings.
    Gasketed fittings prevent leaks between connections without the need for tape or other sealants. Duct has a continuous seam that reinforces it for strength and long life. The rigid construction keeps its shape, even against suction from dust collectors. Duct is smooth on the inside for efficient airflow. Because of its attractive look, spiral duct is often used for exposed heating and cooling systems.
    End Caps
    Image of Product. Front orientation. Duct and Fittings. Tight-Seal Spiral Duct and Fittings, End Caps.
    Cover unused duct openings to prevent air from leaking, dust from escaping, and debris from entering. 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
    with EPDM Gasket
    Duct
    Size
    OD
    Ga.
    Each
    65 7/8"242226K33000000

    Spiral Duct and Fittings

    Image of System. Front orientation. Contains MultipleImages. Duct and Fittings. Spiral Duct and Fittings.
    Reinforced with a continuous seam, this duct keeps its shape, even against suction from dust collection systems. On the inside, duct is smooth for efficient airflow. Because of its attractive look, spiral duct is often used for exposed heating and cooling systems.
    End Caps
    Image of Product. Front orientation. Duct and Fittings. Spiral Duct and Fittings, End Caps.
    Cover unused duct openings to prevent air from leaking, dust from escaping, and debris from entering. 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.
    Corrosion-Resistant 304 Stainless Steel—The most corrosion-resistant metal duct we sell. It won’t rust or degrade in systems that exhaust chemical fumes or vent heat from industrial ovens and dryers.
    Galvanized Steel
    Corrosion-Resistant
    304 Stainless Steel
    Duct
    Size
    OD
    Ga.
    Each
    Each
    65 7/8"245078K380000002561K25000000

    Quick-Disconnect Duct and Fittings

    Image of System. Front orientation. Exploded view. Duct and Fittings. Quick-Disconnect Duct and Fittings.
    The fastest ductwork to disassemble for dust collection and other frequently cleaned systems. Join sections with quick-release clamps that open and close with a flip of the latch. Since you don’t need screws, welds, or tools, the installation time is half that of other duct types.
    Duct with Access Panel
    Image of Product. Front orientation. Duct and Fittings. Quick-Disconnect Duct and Fittings, Duct with Access Panel.
    No need to cut a hole and install a door—just slide the built-in panel to get inside this duct for cleaning and inspection.
    Galvanized Steel—Corrosion resistant and affordable, galvanized steel is the most commonly used ductwork material.
    Opening
    Galvanized Steel
    Duct
    Size
    ID
    Lg.
    Wd.
    Lg.
    Ga.
    Each
    65 7/8"59 1/4"7"14"221761K2790000000
     
    End Caps
    Image of Product. Front orientation. Duct and Fittings. Quick-Disconnect Duct and Fittings, End Caps.
    Cover unused duct openings to prevent air from leaking, dust from escaping, and debris from entering. 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.
    Corrosion-Resistant 304 Stainless Steel—The most corrosion-resistant metal duct we sell. It won’t rust or degrade in systems that exhaust chemical fumes or vent heat from industrial ovens and dryers.
    Galvanized Steel
    Corrosion-Resistant
    304 Stainless Steel
    Duct
    Size
    ID
    Ga.
    Each
    Each
    65 7/8"221761K1650000002538K682000000
     

    Chemical-Resistant Duct and Fittings

    Image of System. Front orientation. Contains MultipleImages. Duct and Fittings. Chemical-Resistant Duct and Fittings.
    Chemicals can eat away at most metal duct, but not this PVC system. It’s often used to exhaust corrosive gases, vapors, and fumes. Components press-fit together and secure with PVC pipe cement.
    Rain Caps
    Image of Product. Front orientation. Duct and Fittings. Chemical-Resistant Duct and Fittings, Rain Caps.
    Prevent blockages that can disrupt airflow in vertical duct and exhaust stacks. These caps keep water and debris from entering your system.
    PVC
    Duct
    Size
    ID
    Color
    Each
    66 5/8"Gray2051K180000000
     
    End Caps
    Image of Product. Front orientation. Duct and Fittings. Chemical-Resistant Duct and Fittings, End Caps.
    Cover unused duct openings to prevent air from leaking, dust from escaping, and debris from entering. 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.
    PVC
    Duct
    Size
    ID
    Color
    Each
    66 5/8"Gray2051K1210000000
     

    Barometric Draft Dampers

    Image of Product. Front orientation. Barometric Draft Dampers.
    These dampers improve furnace performance by automatically opening and closing to maintain a consistent airflow despite changing environmental conditions.
    Single-Acting Damper—Single-acting dampers open inward to prevent strong drafts from pulling too much heat into the chimney vent.
    Double-Acting Damper—Double-acting dampers open both inward and outward to relieve pressure caused by obstructions and downdrafts.
    Steel
    Draft Damper
    Type
    For Duct
    Size
    Ga.
    For System Type
    Fitting
    Connection
    Each
    Single Acting5, 6, 726Coal, OilPress Fit1782K220000000
    Double Acting5, 626Natural Gas, PropanePress Fit1782K18000000

    Airflow Dampers

    Image of Product. Front orientation. Duct Airflow Dampers. Airflow Dampers, Standard Airflow Damper, Female × Male.
    Image of Product. Front orientation. Duct Airflow Dampers. Airflow Dampers, Standard Airflow Damper, Male.
    Image of Product. Front orientation. Duct Airflow Dampers. Airflow Dampers, Gasketed Airflow Damper.
    Image of Product. Front orientation. Duct Airflow Dampers. Airflow Dampers, Blade Airflow Damper.

    Standard Airflow

    Damper, Female ×

    Male

    Standard

    Airflow

    Damper, Male

    Gasketed Airflow Damper

    Blade Airflow

    Damper

    The simplest, most reliable way to regulate airflow in standard duct. Turn the lever to adjust the blade.
    Gasketed Airflow Damper—The blade has a rubber gasket to prevent leaks better than other dampers.
    Blade Airflow Damper—The most economical choice, these dampers slide into the end of duct. Drill a hole for the damper's bolt and remove the handle. Place the damper inside duct, insert the bolt through the hole, and reattach the handle.
    Galvanized Steel—Strong and corrosion resistant, galvanized steel is the most commonly used ductwork material.
    Lightweight Aluminum—One-third the weight of steel, aluminum duct is easier to handle during installation. It resists rust in wet environments but won’t last as long as steel.
    Galvanized Steel
    Lightweight
    Aluminum
    Duct
    Size
    Dia.
    ID
    OD
    Overall
    Lg.
    Ga.
    Gasket
    Material
    Each
    Each
    Standard Airflow Damper
     
    Female × Male
    6—6"5 7/8"5 3/8"20————01773K44000000
     
    Male
    6——5 3/4"4 1/2"20—17355K61000000———0
     
    Gasketed Airflow Damper
     
    Male
    6——5 7/8"10"20Neoprene
    		2041K32000000———0
     
    Blade Airflow Damper
    66"———28—3996K170000———0
     

    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 Round Duct
    Image of Product. Front orientation. Duct Fire Dampers. For Round Duct.
    Galvanized Steel—Strong and corrosion resistant, galvanized steel is the most commonly used ductwork material.
    Overall
    Galvanized Steel
    Duct
    Size
    OD
    Ht.
    Wd.
    Fire Safety
    Std.
    Fusible Link
    Melting Temp., ° F
    Ga.
    Each
    65 3/4"8 3/4"8 3/4"UL 555
    		1652219215K270000000
    Fusible Links
    Each
    Replacement Fusible Link with 165° F Melting Temperature19215K3200000
    Fusible Link with 212° F Melting Temperature 19215K960000
    Fusible Link with 386° F Melting Temperature 19215K1900000

    Airflow Dampers for Chemical-Resistant Duct

    Image of Product. Front orientation. Duct Airflow Dampers. Airflow Dampers for Chemical-Resistant Duct.
    Turn the lever on these dampers to regulate airflow in PVC duct. They withstand chemicals that would break down most metal components. Secure to duct with PVC pipe cement (not included).
    PVC
    Duct
    Size
    ID
    Overall
    Lg.
    Color
    Each
    66 5/8"8 1/4"Gray2051K160000000

    Automatic Airflow Dampers

    Image of Product. Front orientation. Duct Airflow Dampers. Automatic Airflow Dampers.
    Keep temperatures comfortable while saving energy. Control these dampers with a switch or thermostat so you’re only heating and cooling the areas that need it.
    Galvanized Steel—Strong and corrosion resistant, galvanized steel is the most commonly used ductwork material.
    Overall
    Galvanized Steel
    Duct
    Size
    ID
    OD
    Ht.
    Wd.
    Electrical
    Connection Type
    Voltage,
    V AC
    Ga.
    Each
    66"5 7/8"10 1/4"8"Hardwire24241179N160000000

    Airflow Dampers for Quick-Disconnect Duct

    Image of Product. Front orientation. Duct Airflow Dampers. Airflow Dampers for Quick-Disconnect Duct.
    Regulate airflow to sections of quick-disconnect duct. Often used in dust collection systems, these dampers attach with quick-release clamps. Turn the lever to adjust airflow.
    Galvanized Steel—Strong and corrosion resistant, galvanized steel is the most commonly used ductwork material.
    Corrosion-Resistant 304 Stainless Steel—The most corrosion-resistant metal duct we sell outperforms galvanized steel in harsh environments. It won’t rust or degrade in systems that exhaust chemical fumes or vent heat from industrial ovens and dryers.
    Galvanized Steel
    Corrosion-Resistant
    304 Stainless Steel
    Duct
    Size
    ID
    Overall
    Lg.
    Ga.
    Each
    Each
    66"8"221761K1530000002538K6730000000
    Duct Clamps
    Image of Product. Front orientation. Duct and Fittings.
    Match clamps to your duct material.
    Galvanized Steel
    Corrosion-Resistant
    304 Stainless Steel
    Duct
    Size
    Each
    Each
    61761K240000002538K133000000

    Drop-Ceiling Diffuser Dampers

    Image of Product. Front orientation. Diffuser Dampers. Butterfly Opening/Closing Style.

    Butterfly

    Opening/Closing

    Style

    Image of Product. Front orientation. Diffuser Dampers. Radial Opening/Closing Style.

    Radial Opening/Closing

    Style

    For use with drop-ceiling diffusers and ready-to-connect drop-ceiling diffusers, these dampers regulate airflow. Dampers mount to a collar.
    Butterfly Opening/Closing Style—Dampers with a butterfly opening/closing style open on a middle hinge. The removable handle adjusts the damper to control airflow and is easier to adjust than dampers with a radial opening/closing style.
    Radial Opening/Closing Style—Dampers with a radial opening/closing style open in a circle for more precise airflow than dampers with a butterfly opening/closing style.
    For Duct
    Size
    Material
    Each
    Butterfly Opening/Closing Style
    6Galvanized Steel18525K81000000
     
    Radial Opening/Closing Style
    6Galvanized Steel18525K11100000
     
    back to top