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)
    95 Products

    Filter-Ready Return Grilles for Drop Ceilings

    Image of Product. Front orientation. Return Grilles. Filter-Ready Return Grilles for Drop Ceilings, Painted Steel, Louvered Diffuser.
    Image of Product. Front orientation. Return Grilles. Filter-Ready Return Grilles for Drop Ceilings, Painted Steel, Perforated Diffuser.

    Painted Steel

    Louvered Diffuser

    Painted Steel

    Perforated Diffuser

    Place these grilles in the grid of a drop ceiling to create return airflow to your HVAC system without a duct. Add a filter (not included) for protection against dust and debris.
    For Ceiling
    Tile, ft.
    For
    Filter
    Diffuser
    Type
    Wd.
    Lg.
    Color
    Trade
    Size
    Thk.
    Mounting
    Location
    Each
    Painted Steel
    Louvered22White20 × 201"Ceiling000000000000
    Perforated22White20 × 201"Ceiling00000000000
     

    Ready-to-Connect Drop-Ceiling Diffusers

    No additional fittings or collars needed—connect to round duct with the included collar. These diffusers fit in the grid of a drop ceiling to evenly disperse airflow and maintain a consistent temperature throughout the space.
    For Ceiling
    Tile, ft.
    For Duct
    Size
    Wd.
    Lg.
    OD
    Gender
    Diffuser
    Shape
    Material
    Color
    Back Panel
    Material
    Louvered
    Diffuser Type
    Includes
    Each
    Louvered Diffusers
    Image of Product. Front orientation. Diffusers. Ready-to-Connect Drop-Ceiling Diffusers, Louvered Diffusers.
    6225 7/8"MaleSquarePainted SteelWhiteSteel3 TierCollar000000000000000
    6226"MaleSquarePainted SteelWhiteSteel2 TierCollar0000000000000
    8227 7/8"MaleSquarePainted SteelWhiteSteel3 TierCollar00000000000000
    8228"MaleSquarePainted SteelWhiteSteel2 TierCollar0000000000000
    10229 7/8"MaleSquarePainted SteelWhiteSteel3 TierCollar00000000000000
    102210"MaleSquarePainted SteelWhiteSteel2 TierCollar0000000000000
    122211 7/8"MaleSquarePainted SteelWhiteSteel3 TierCollar00000000000000
    122212"MaleSquarePainted SteelWhiteSteel2 TierCollar0000000000000
    142213 7/8"MaleSquarePainted SteelWhiteSteel3 TierCollar00000000000000
    142214"MaleSquarePainted SteelWhiteSteel2 TierCollar0000000000000
     
    Perforated Diffusers
    Image of Product. Front orientation. Diffusers. Ready-to-Connect Drop-Ceiling Diffusers, Perforated Diffusers.
    6226"MaleSquarePainted SteelWhiteSteel—Collar00000000000000
    8228"MaleSquarePainted SteelWhiteSteel—Collar00000000000000
    102210"MaleSquarePainted SteelWhiteSteel—Collar00000000000000
    122212"MaleSquarePainted SteelWhiteSteel—Collar00000000000000
    142214"MaleSquarePainted SteelWhiteSteel—Collar000000000000000
     
    Plaque Diffusers
    Image of Product. Front orientation. Diffusers. Ready-to-Connect Drop-Ceiling Diffusers, Plaque Diffusers.
    6226"MaleSquarePainted SteelWhiteSteel1 TierCollar00000000000000
    8228"MaleSquarePainted SteelWhiteSteel1 TierCollar00000000000000
    102210"MaleSquarePainted SteelWhiteSteel1 TierCollar00000000000000
    122212"MaleSquarePainted SteelWhiteSteel1 TierCollar00000000000000
    142214"MaleSquarePainted SteelWhiteSteel1 TierCollar00000000000000
     
    Accessories for Diffusers
    Diffuser Dampers
    For use with drop-ceiling diffusers and ready-to-connect drop-ceiling diffusers, these diffuser dampers regulate airflow. The removable handle adjusts the diffuser damper to control airflow. Diffuser 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.
    Butterfly
    Opening/Closing Style
    Radial
    Opening/Closing Style
    For Duct
    Size
    Material
    Each
    Each
    6Galvanized Steel00000000000000000000000000000
    8Galvanized Steel000000000000000000000000000
    10Galvanized Steel000000000000000000000000000
    12Galvanized Steel000000000000000000000000000
    14Galvanized Steel000000000000000000000000000
    Touch-Up Paint Pens
    Prep, paint, and seal small scratches on metal surfaces with these pens.
    Dry
    Time
    Container
    Size, fl. oz.
    Solution
    Type
    Formulation
    Touch,
    sec.
    O'all,
    min.
    Max.
    Temp.
    For Use
    Outdoors
    For Use On
    Color
    (Appearance)
    Each
    0.3Solvent BasedAcrylic Plastic
    		301Not RatedNoAluminum, Steel, IronWhite (Gloss)00000000000000

    Ready-to-Connect Ceiling Diffusers

    Image of Product. Front orientation. Diffusers. Ready-to-Connect Ceiling Diffusers, Round Diffuser.
    Image of Product. Front orientation. Diffusers. Ready-to-Connect Ceiling Diffusers, Square Diffuser.

    Round Diffuser

    Square Diffuser

    Diffusers come with a collar and damper already in place for simple installation. They evenly disperse airflow into a room to maintain a consistent temperature throughout the space. Collar is adjustable to fit a range of duct sizes.
    Made of plastic, these diffusers are impact, abrasion, and chemical resistant.
    Overall
    For Duct
    Size
    Dia.
    Lg.
    Wd.
    Diffuser
    Shape
    Material
    Color
    Mounting Fasteners
    Included
    Each
    6, 7, 8—11 1/4"11 1/4"SquarePlasticWhiteYes000000000000
    6, 7, 812 1/8"——RoundPlasticWhiteYes00000000000
     

    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 Steel00000000000000
    8Galvanized Steel0000000000000
    10Galvanized Steel0000000000000
    12Galvanized Steel0000000000000
    14Galvanized Steel0000000000000
     
    Radial Opening/Closing Style
    6Galvanized Steel00000000000000
    8Galvanized Steel00000000000000
    10Galvanized Steel00000000000000
    12Galvanized Steel00000000000000
    14Galvanized Steel00000000000000
     

    Wall/Ceiling Registers

    Image of Product. Front orientation. Registers. Wall/Ceiling Registers, One-Way Airflow.
    Image of Product. Front orientation. Registers. Wall/Ceiling Registers, Three-Way Airflow.
    Image of Product. Front orientation. Registers. Wall/Ceiling Registers, Four-Way Airflow.
    Image of Product. Front orientation. Registers. Wall/Ceiling Registers, Adjustable Airflow.

    One-Way Airflow

    Three-Way Airflow

    Four-Way Airflow

    Adjustable Airflow

    Image of Specification. Side1 orientation. Surface Mount. Wall/Ceiling Registers.

    Surface

    Mount

    Direct air coming out of HVAC systems. Adjust the damper to control airflow.
    Adjustable Airflow—Adjustable airflow registers have fins that can be turned to alter the airflow direction.
    For
    Opening
    Faceplate
    White Painted Steel
    Frame and Blade
    Wd.
    Ht.
    Wd.
    Ht.
    Mounting
    Profile
    Mounting Fasteners
    Included
    Each
    One-Way Airflow
    8"4"9 3/8"5 3/8"SurfaceYes00000000000000
    10"4"11 3/8"5 3/8"SurfaceYes0000000000000
    12"6"13 3/8"7 3/8"SurfaceYes0000000000000
    14"6"15 3/8"7 3/8"SurfaceYes0000000000000
     
    Three-Way Airflow
    10"4"11 3/8"5 3/8"SurfaceYes0000000000000
    10"6"11 3/8"7 3/8"SurfaceYes0000000000000
    12"6"13 3/8"7 3/8"SurfaceYes0000000000000
     
    Four-Way Airflow
    10"10"11 3/8"11 3/8"SurfaceYes0000000000000
    12"12"13 3/8"13 3/8"SurfaceYes0000000000000
    14"14"15 3/8"15 3/8"SurfaceYes0000000000000
    16"16"17 3/8"17 3/8"SurfaceYes0000000000000
     
    Adjustable Airflow
    8"6"9 3/4"7 3/4"SurfaceYes0000000000000
    10"6"11 3/4"7 3/4"SurfaceYes0000000000000
    12"4"13 3/4"5 3/4"SurfaceYes0000000000000
    12"6"13 3/4"7 3/4"SurfaceYes0000000000000
    12"8"13 3/4"9 3/4"SurfaceYes0000000000000
    14"6"15 3/4"7 3/4"SurfaceYes0000000000000
    14"8"15 3/4"9 3/4"SurfaceYes0000000000000
    16"4"17 3/4"5 3/4"SurfaceYes0000000000000
    16"6"17 3/4"7 3/4"SurfaceYes0000000000000
    16"8"17 3/4"9 3/4"SurfaceYes0000000000000
     

    Ready-to-Connect Moisture-Resistant Drop-Ceiling Diffusers

    Image of Product. Front orientation. Diffusers. Ready-to-Connect Moisture-Resistant Drop-Ceiling Diffusers, Louvered Diffusers.

    Louvered Diffusers

    A vapor barrier provides moisture protection as these diffusers evenly disperse airflow and maintain a consistent temperature throughout the space. No additional fittings or collars needed—connect to round duct with the included collar. Diffusers fit in the grid of a drop ceiling.
    6 Insulation R Value—Diffusers with 6 insulation R value maintain temperature more effectively than diffusers with 1 insulation R value.
    Diffusers
    Diffuser
    Insulation Blankets
    For Ceiling
    Tile, ft.
    For Duct
    Size
    Wd.
    Lg.
    OD
    Gender
    Diffuser
    Shape
    Material
    Color
    Insulation
    R Value
    Each
    Each
    Louvered Diffusers
    6226"MaleSquarePainted SteelWhite100000000000000000000000000000
    6226"MaleSquarePainted SteelWhite600000000000000000000000000000
    8228"MaleSquarePainted SteelWhite1000000000000000000000000000
    8228"MaleSquarePainted SteelWhite600000000000000000000000000000
    102210"MaleSquarePainted SteelWhite1000000000000000000000000000
    102210"MaleSquarePainted SteelWhite600000000000000000000000000000
    122212"MaleSquarePainted SteelWhite1000000000000000000000000000
    122212"MaleSquarePainted SteelWhite600000000000000000000000000000
    142214"MaleSquarePainted SteelWhite10000000000000000000000000000
    142214"MaleSquarePainted SteelWhite600000000000000000000000000000
     
    Accessories for Diffusers
    Diffuser Dampers
    For use with drop-ceiling diffusers and ready-to-connect drop-ceiling diffusers, these diffuser dampers regulate airflow. The removable handle adjusts the diffuser damper to control airflow. Diffuser 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.
    Butterfly
    Opening/Closing Style
    Radial
    Opening/Closing Style
    For Duct
    Size
    Material
    Each
    Each
    6Galvanized Steel00000000000000000000000000000
    8Galvanized Steel000000000000000000000000000
    10Galvanized Steel000000000000000000000000000
    12Galvanized Steel000000000000000000000000000
    14Galvanized Steel000000000000000000000000000
    Touch-Up Paint Pens
    Prep, paint, and seal small scratches on metal surfaces with these pens.
    Dry
    Time
    Container
    Size, fl. oz.
    Solution
    Type
    Formulation
    Touch,
    sec.
    O'all,
    min.
    Max.
    Temp.
    For Use
    Outdoors
    For Use On
    Color
    (Appearance)
    Each
    0.3Solvent BasedAcrylic Plastic
    		301Not RatedNoAluminum, Steel, IronWhite (Gloss)00000000000000

    Air Diverters

    Guide air toward your workspace or deflect unwanted drafts with these diverters and covers. They fit over HVAC vents, diffusers, and registers to direct hot and cold air.
    Ceiling, Side Diverters
    Image of ProductInUse. Front orientation. Air Diverters. Ceiling, Side Diverters.
    Diverters direct air without restricting flow.
    Slide In—Slide-in-mount diverters fit between your diffuser and a drop ceiling grid.
    For Ceiling
    Tile, ft.
    Wd.
    Lg.
    Lg.
    Wd.
    Dp.
    Material
    Color
    Each
    Slide In
    2223 3/4"12"2 1/2"PolystyreneWhite0000000000000
     
    Ceiling, Corner Diverters
    Image of ProductInUse. Front orientation. Air Diverters. Ceiling, Corner Diverters.
    Diverters direct air without restricting flow.
    Slide In—Slide-in-mount diverters fit between your diffuser and a drop ceiling grid.
    For Ceiling
    Tile, ft.
    Wd.
    Lg.
    Lg.
    Wd.
    Dp.
    Material
    Color
    Each
    Slide In
    2222 1/4"22 1/4"2 1/2"PolystyreneWhite0000000000000
     

    Drop-Ceiling Diffusers

    Image of Product. Front orientation. Diffusers. Drop-Ceiling Diffusers, Grid Diffusers.

    Grid Diffusers

    Image of Product. Front orientation. Diffusers. Drop-Ceiling Diffusers, Perforated Diffusers.

    Perforated Diffusers

    Place these diffusers in the grid of a drop ceiling to evenly disperse airflow and maintain consistent temperature throughout the space. Connect to round duct with a diffuser collar (not included).
    Grid Diffusers—Grid diffusers are often used with cooling systems. They disperse a thin layer of air along the ceiling for even distribution.
    Perforated Diffusers—Perforated diffusers have more openings than grid diffusers to release more air.
    Diffusers
    Replacement
    Diffuser Faces
    For Ceiling
    Tile, ft.
    For Duct
    Size
    Wd.
    Lg.
    Diffuser
    Shape
    Material
    Color
    Back Panel
    Material
    Insulation
    R Value
    Each
    Each
    Grid Diffusers
    6, 8, 10, 1222SquarePainted SteelWhiteFiberglass600000000000000000000000000
     
    Perforated Diffusers
    6, 8, 10, 1222SquarePainted SteelWhiteFiberglass6000000000000000000000000
     
    Accessories for Diffusers
    Diffuser Collars
    Image of Product. Front orientation. Diffuser Collars. Drop-Ceiling Diffusers.
    Connect drop-ceiling diffusers to duct. Use the included push-in fasteners to attach collar to diffuser.
    For Duct
    Size
    OD
    Gender
    Material
    Each
    65 15/16"MaleGalvanized Steel00000000000000
    87 15/16"MaleGalvanized Steel0000000000000
    109 15/16"MaleGalvanized Steel0000000000000
    1211 15/16"MaleGalvanized Steel0000000000000
    Diffuser Dampers
    For use with drop-ceiling diffusers and ready-to-connect drop-ceiling diffusers, these diffuser dampers regulate airflow. The removable handle adjusts the diffuser damper to control airflow. Diffuser dampers mount to a collar.
    Butterfly
    Opening/Closing Style
    For Duct
    Size
    Material
    Each
    6Galvanized Steel00000000000000
    8Galvanized Steel0000000000000
    10Galvanized Steel0000000000000
    12Galvanized Steel0000000000000

    Ceiling Diffusers

    Image of Product. Front orientation. Diffusers. Ceiling Diffusers.
    Image of Product. Front orientation. Diffuser Collars. Ceiling Diffusers.
    Image of Product. Front orientation. Diffuser Collars. Ceiling Diffusers, Diffuser Collars with Airflow Damper.

    Diffuser Collars

    Diffuser Collars

    with Airflow Damper

    Evenly disperse airflow into a room to maintain a consistent temperature throughout the space.
    Diffuser Collars—Diffuser collars connect diffusers to duct. They are sold separately.
    Diffuser Collars with Airflow Damper—Diffuser collars with airflow damper connect diffusers to duct. They are sold separately and adjust to control airflow.
    Diffusers
    Diffuser Collars
    Diffuser Collars with
    Airflow Damper
    For Duct
    Size
    Overall
    Dia.
    Diffuser
    Shape
    Material
    Color
    Mounting Fasteners
    Included
    Each
    Each
    Each
    610"RoundPainted SteelWhiteYes000000000000000000000000000000000000000
    812"RoundPainted SteelWhiteYes000000000000000000000000000000000000
    1014"RoundPainted SteelWhiteYes000000000000000000000000000000000000
    1216"RoundPainted SteelWhiteYes000000000000000000000000000000000000
    1418"RoundPainted SteelWhiteYes000000000000000000000000000000000000
     

    Snap-On Drop-Ceiling Diffuser Collars

    Image of Product. Front orientation. Diffuser Collars.
    Connect drop-ceiling diffusers to duct. Use the included push-in fasteners to attach collar to diffuser.
    For Duct
    Size
    OD
    Gender
    Material
    Each
    65 15/16"MaleGalvanized Steel00000000000000
    87 15/16"MaleGalvanized Steel0000000000000
    109 15/16"MaleGalvanized Steel0000000000000
    1211 15/16"MaleGalvanized Steel0000000000000

    Moisture-Resistant Drop-Ceiling Diffusers

    Image of Product. Front orientation. Diffusers. Moisture-Resistant Drop-Ceiling Diffusers, Grid Diffusers.

    Grid Diffusers

    Image of Product. Front orientation. Diffusers. Moisture-Resistant Drop-Ceiling Diffusers, Perforated Diffusers.

    Perforated Diffusers

    A vapor barrier provides moisture protection as these diffusers evenly disperse airflow and maintain a consistent temperature throughout the space. They fit in the grid of a drop ceiling. Connect to round duct with a diffuser collar (not included).
    Grid Diffusers—Grid diffusers are often used with cooling systems. They disperse a thin layer of air along the ceiling for even distribution.
    Perforated Diffusers—Perforated diffusers have more openings than grid diffusers to release more air.
    Diffusers
    Replacement
    Diffuser Faces
    For Ceiling
    Tile, ft.
    For Duct
    Size
    Wd.
    Lg.
    Diffuser
    Shape
    Material
    Color
    Back Panel
    Material
    Insulation
    R Value
    Each
    Each
    Grid Diffusers
    6, 8, 10, 1222SquarePainted SteelWhiteSteel6000000000000000000000000000
     
    Perforated Diffusers
    6, 8, 10, 1222SquarePainted SteelWhiteSteel60000000000000000000000000
     
    Accessories for Diffusers
    Diffuser Collars
    Image of Product. Front orientation. Diffuser Collars. For Drop Ceilings, Ceiling Mount.
    Connect drop-ceiling diffusers to duct. Use the included push-in fasteners to attach collar to diffuser.
    For Duct
    Size
    OD
    Gender
    Material
    Each
    65 15/16"MaleGalvanized Steel00000000000000
    87 15/16"MaleGalvanized Steel0000000000000
    109 15/16"MaleGalvanized Steel0000000000000
    1211 15/16"MaleGalvanized Steel0000000000000
    Diffuser Dampers
    For use with drop-ceiling diffusers and ready-to-connect drop-ceiling diffusers, these diffuser dampers regulate airflow. The removable handle adjusts the diffuser damper to control airflow. Diffuser dampers mount to a collar.
    Butterfly
    Opening/Closing Style
    For Duct
    Size
    Material
    Each
    6Galvanized Steel00000000000000
    8Galvanized Steel0000000000000
    10Galvanized Steel0000000000000
    12Galvanized Steel0000000000000
    back to top