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)
    109 Products

    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
    3—3"2 7/8"5 3/8"20————01773K41000000
    4—4"3 7/8"5 3/8"20————01773K4200000
    6—6"5 7/8"5 3/8"20————01773K4400000
     
    Male
    4——3 3/4"4 1/2"20—17355K59000000———0
    5——4 3/4"4 1/2"20—17355K5100000———0
    6——5 3/4"4 1/2"20—17355K6100000———0
    7——6 3/4"4 1/2"20—17355K5300000———0
    8——7 3/4"4 1/2"20—17355K6300000———0
    9——8 3/4"4 1/2"20—17355K5500000———0
    10——9 3/4"4 1/2"20—17355K6500000———0
    12——11 3/4"4 1/2"20—17355K6700000———0
    14——13 3/4"4 1/2"20—17355K69000000———0
    16——15 3/4"4 1/2"20—17355K71000000———0
    18——17 3/4"4 1/2"20—17355K73000000———0
    20——19 3/4"4 1/2"18—17355K75000000———0
    22——21 3/4"4 1/2"18—17355K57000000———0
    24——23 3/4"4 1/2"18—17355K76000000———0
     
    Gasketed Airflow Damper
     
    Male
    4——3 7/8"10"20Neoprene
    		2041K31000000———0
    6——5 7/8"10"20Neoprene
    		2041K32000000———0
    8——7 7/8"10"20Neoprene
    		2041K33000000———0
    10——9 7/8"10"20Neoprene
    		2041K34000000———0
    12——11 7/8"10"20Neoprene
    		2041K35000000———0
     
    Blade Airflow Damper
    44"———28—3996K110000———0
    55"———28—3996K140000———0
    66"———28—3996K170000———0
    77"———28—3996K200000———0
    88"———28—3996K2300000———0
    99"———26—3996K260000———0
    1010"———26—3996K2900000———0
    1212"———26—3996K3200000———0
    1414"———24—3996K3500000———0
     

    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
    33 3/16"8"221761K395000000———0
    43 15/16"8"221761K151000002538K6710000000
    54 15/16"8"221761K152000002538K672000000
    66"8"221761K153000002538K673000000
    77"8"221761K627000002538K762000000
    88"13"221761K154000002538K674000000
    99"13"221761K628000002538K763000000
    1010"13"221761K155000002538K675000000
    1212 1/8"13"201761K156000002538K676000000
    1414 1/8"17"201761K1610000002538K677000000
    1616 1/8"17"201761K1620000002538K678000000
    1818 1/8"23"201761K396000000———0
    2020 1/8"23"201761K397000000———0
    2222 1/8"23"201761K398000000———0
    2424 1/16"23"201761K399000000———0
    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
    31761K103000000———0
    41761K22000002538K131000000
    51761K23000002538K13200000
    61761K24000002538K13300000
    71761K603000002538K72700000
    81761K137000002538K13400000
    91761K604000002538K72800000
    101761K138000002538K13500000
    121761K139000002538K13600000
    141761K145000002538K66800000
    161761K146000002538K66900000
    181761K10100000———0
    201761K10200000———0
    221761K33300000———0
    241761K33400000———0

    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
    55"4 7/8"9 1/4"7"Hardwire24241179N150000000
    66"5 7/8"10 1/4"8"Hardwire24241179N16000000
    88"7 7/8"12 1/4"10"Hardwire24241179N18000000
    1010"9 7/8"14 1/4"12"Hardwire24241179N21000000
    1212"11 7/8"16 1/4"14"Hardwire24241179N22000000
    1414"13 7/8"18 1/4"16"Hardwire24221179N24000000
    1616"15 7/8"20 1/4"18"Hardwire24221179N26000000
    1818"17 7/8"22 1/4"20"Hardwire24221179N28000000

    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
    44 1/2"7 1/2"Gray2051K1650000000
    66 5/8"8 1/4"Gray2051K16000000
    88 5/8"10 1/2"Gray2051K36000000
    1010 3/4"13"Gray2051K56000000
    1212 3/4"14 1/2"Gray2051K76000000

    Airflow Dampers for Square Duct

    Image of Product. Front orientation. Duct Airflow Dampers. Airflow Dampers for Square Duct.
    Direct airflow to different zones in your facility or regulate the amount of outside air introduced to your system. Turn the lever on these dampers to adjust the blades.
    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.
    Ga.
    Gasket
    Material
    Each
    12"12"11 3/4"11 3/4"5 1/2"16Vinyl Plastic2041K120000000
    14"14"13 3/4"13 3/4"5 1/2"16Vinyl Plastic2041K13000000
    16"16"15 3/4"15 3/4"5 1/2"16Vinyl Plastic2041K14000000
    24"24"23 3/4"23 3/4"5 1/2"16Vinyl Plastic2041K22000000
    36"36"35 3/4"35 3/4"5 1/2"16Vinyl Plastic2041K27000000

    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
    8Galvanized Steel18525K8200000
    10Galvanized Steel18525K8300000
    12Galvanized Steel18525K8400000
    14Galvanized Steel18525K8500000
     
    Radial Opening/Closing Style
    6Galvanized Steel18525K11100000
    8Galvanized Steel18525K11200000
    10Galvanized Steel18525K11300000
    12Galvanized Steel18525K11400000
    14Galvanized Steel18525K11500000
     
    back to top