• Products and Solutions
    • Grilles & Registers
      • Supply, Steel
      • Supply, Aluminum
      • Return, Steel
      • Return, Aluminum
      • Curved Blade, Aluminum (1, 2, 3 or 4-way)
      • Heavy Duty, Steel, Supply
      • Heavy Duty, Steel, Return
      • Grid Core Return
      • Transfer and Door Grilles
      • Perforated Return Grilles
      • AVF Versaflex
      • G-Series
      • Return Filter Grilles
      • Supply Aluminum, Aerovane
      • Grid Core Return 45-Degree Deflection
    • Square/Round Diffusers
      • Stepdown 3-Cone
      • Stepdown 2-Cone
      • Architectural Plaque Diffuser
      • M-Series Louvered Face-Square Neck
      • Agitair® RC Series
      • Modular Core Diffuser
      • Concentric Supply Return
      • Round Diffuser, 3-Cone
      • Round Diffuser, 4-Cone
      • Industrial Round Diffuser
      • Fire Rated Series
      • Architectural Swirl Face
      • M-Series Louvered Face-Round Neck
      • Round Architectural Plaque Diffuser
    • Perforated Diffusers
      • Supply, Adjustable Curved Blade
      • Supply Face Mounted Deflectors
      • Supply, Modular Core
      • Return, Perf Panel Only
      • Return Diffuser
    • Linear/Slot Diffusers
      • 4000 Series Linear Grilles
      • Agitair® Stripline® Diffusers
      • 6000 Series Slot Diffusers
      • AIR-TRAC Architectural Linear Diffuser
    • Plenum Slots
      • Supply, Single Vane
      • Supply, Modulinear
      • High Capacity Plenum Slot
      • Return Slot Diffuser
      • High Induction Series
      • Supply, Fixed Vane
    • Security Grilles
      • Perforated Supply
      • Transfer Grille, Perforated Pattern
      • Louvered Face Diffuser With Lattice Face Plate
      • Bar Grille, Steel
      • Bar Grille, Aluminum
      • Lattice Face Plate, Steel
      • Lattice Face Plate, Aluminum
      • Security Duct Bars With Sleeve
      • Security Duct Bars With Frame
      • Suicide Deterrent Security Grille
      • Maximum Security Lattice Face With Mesh Screen
    • Critical Environment
      • Radial Flow, Fixed
      • Radial Flow, Adjustable
      • OR Linear Curtain, V-Slot
      • Laminar Flow, Tensor™
      • ISOTEK
      • Laminar Terminal Diffusers, LTD
    • Specialty Products
      • Stainless Steel Supply Grilles
      • Stainless Steel Return Grilles
      • Industrial Supply Grilles, Pole-Operated Blades
      • GJ Jet-Flo®
      • Roto-Jet® Drum Grilles
      • Electronically Controlled VAV Diffuser
      • Roto-Jet® Spiral Duct Drum Grilles
      • Discus Series Spot Diffusers
      • Discus Series Supply Grilles
      • Discus Series Air Foil Round Supply Grilles
      • Discus Series Industrial Round Supply Grilles
      • Thermal VAV Diffusers
      • Heavy Duty Airfoil Grilles
      • Constant Flow Regulator
      • Spiral Duct Series
    • Underfloor Products
      • UnderFloor Rounds
    • Accessories
      • Round Dampers
      • Grids, Extractors, Turning Vanes
      • Square to Round Adapters
      • Adapter Plaster Frames
      • HEPA Air Filter
      • Plaster Frame
      • Square/Rectangular Dampers, Steel
      • Square/Rectangular Dampers, Aluminum
      • Return Hood
    • Air Handling Coils
      • Air Handling Coils
    • Terminal Units
      • Single Duct Terminal Unit
      • Dual Duct Terminal Unit
      • Single Duct Round Terminal Unit
      • Dual Single Duct Terminal Unit
      • Laboratory Exhaust Valve
      • Bypass Terminal Unit
      • Low Profile Fan Powered Constant Terminal Unit
      • Low Profile Fan Powered Variable Terminal Unit
      • Fan Powered Series Terminal Unit
      • Fan Powered Parallel Terminal Unit
    • Displacement Diffusers
      • Semi-circular, 180°
      • Rectangular, Flush Mount
      • Rectangular, Stair Riser or Surface Mount
      • Curved, Corner Mount
      • Rectangular, Flush or Wall Mount
      • Semi-Circular, Wall or Surface Mount
      • Circular, 360°
  • Services and Support
    • Training
    • Webinars
    • GRD Products Webinars
  • Resources
    • Engineering Resources
    • Installation Manuals
    • Revit
    • Product Catalog
    • Installation Videos
  • Insights
  • Find a Rep
Rep Login
  • Products and Solutions
    • Grilles & Registers
      • Supply, Steel
      • Supply, Aluminum
      • Return, Steel
      • Return, Aluminum
      • Curved Blade, Aluminum (1, 2, 3 or 4-way)
      • Heavy Duty, Steel, Supply
      • Heavy Duty, Steel, Return
      • Grid Core Return
      • Transfer and Door Grilles
      • Perforated Return Grilles
      • AVF Versaflex
      • G-Series
      • Return Filter Grilles
      • Supply Aluminum, Aerovane
      • Grid Core Return 45-Degree Deflection
    • Square/Round Diffusers
      • Stepdown 3-Cone
      • Stepdown 2-Cone
      • Architectural Plaque Diffuser
      • M-Series Louvered Face-Square Neck
      • Agitair® RC Series
      • Modular Core Diffuser
      • Concentric Supply Return
      • Round Diffuser, 3-Cone
      • Round Diffuser, 4-Cone
      • Industrial Round Diffuser
      • Fire Rated Series
      • Architectural Swirl Face
      • M-Series Louvered Face-Round Neck
      • Round Architectural Plaque Diffuser
    • Perforated Diffusers
      • Supply, Adjustable Curved Blade
      • Supply Face Mounted Deflectors
      • Supply, Modular Core
      • Return, Perf Panel Only
      • Return Diffuser
    • Linear/Slot Diffusers
      • 4000 Series Linear Grilles
      • Agitair® Stripline® Diffusers
      • 6000 Series Slot Diffusers
      • AIR-TRAC Architectural Linear Diffuser
    • Plenum Slots
      • Supply, Single Vane
      • Supply, Modulinear
      • High Capacity Plenum Slot
      • Return Slot Diffuser
      • High Induction Series
      • Supply, Fixed Vane
    • Security Grilles
      • Perforated Supply
      • Transfer Grille, Perforated Pattern
      • Louvered Face Diffuser With Lattice Face Plate
      • Bar Grille, Steel
      • Bar Grille, Aluminum
      • Lattice Face Plate, Steel
      • Lattice Face Plate, Aluminum
      • Security Duct Bars With Sleeve
      • Security Duct Bars With Frame
      • Suicide Deterrent Security Grille
      • Maximum Security Lattice Face With Mesh Screen
    • Critical Environment
      • Radial Flow, Fixed
      • Radial Flow, Adjustable
      • OR Linear Curtain, V-Slot
      • Laminar Flow, Tensor™
      • ISOTEK
      • Laminar Terminal Diffusers, LTD
    • Specialty Products
      • Stainless Steel Supply Grilles
      • Stainless Steel Return Grilles
      • Industrial Supply Grilles, Pole-Operated Blades
      • GJ Jet-Flo®
      • Roto-Jet® Drum Grilles
      • Electronically Controlled VAV Diffuser
      • Roto-Jet® Spiral Duct Drum Grilles
      • Discus Series Spot Diffusers
      • Discus Series Supply Grilles
      • Discus Series Air Foil Round Supply Grilles
      • Discus Series Industrial Round Supply Grilles
      • Thermal VAV Diffusers
      • Heavy Duty Airfoil Grilles
      • Constant Flow Regulator
      • Spiral Duct Series
    • Underfloor Products
      • UnderFloor Rounds
    • Accessories
      • Round Dampers
      • Grids, Extractors, Turning Vanes
      • Square to Round Adapters
      • Adapter Plaster Frames
      • HEPA Air Filter
      • Plaster Frame
      • Square/Rectangular Dampers, Steel
      • Square/Rectangular Dampers, Aluminum
      • Return Hood
    • Air Handling Coils
      • Air Handling Coils
    • Terminal Units
      • Single Duct Terminal Unit
      • Dual Duct Terminal Unit
      • Single Duct Round Terminal Unit
      • Dual Single Duct Terminal Unit
      • Laboratory Exhaust Valve
      • Bypass Terminal Unit
      • Low Profile Fan Powered Constant Terminal Unit
      • Low Profile Fan Powered Variable Terminal Unit
      • Fan Powered Series Terminal Unit
      • Fan Powered Parallel Terminal Unit
    • Displacement Diffusers
      • Semi-circular, 180°
      • Rectangular, Flush Mount
      • Rectangular, Stair Riser or Surface Mount
      • Curved, Corner Mount
      • Rectangular, Flush or Wall Mount
      • Semi-Circular, Wall or Surface Mount
      • Circular, 360°
  • Services and Support
    • Training
    • Webinars
    • GRD Products Webinars
  • Resources
    • Engineering Resources
    • Installation Manuals
    • Revit
    • Product Catalog
    • Installation Videos
  • Insights
  • Find a Rep
Search
Search Rep Login
  1. Home
  2. Products and Solutions
  3. Square/Round Diffusers
  4. M-Series Louvered Face-Square Neck
  5. M Steel, fixed pattern, square / rectangular neck
Product Image_AMSR
  • Thumb Image_AMSR

M Steel, fixed pattern, square / rectangular neck

Square/ Round Diffusers

Constructed of a heavy-duty margin and a one-piece removable center core, the steel M diffuser line has a multitude of air patterns, sizes, and mounting methods that result in a broad offering of products for exceptional versatility and flexibility.

  • The product has removable snap-in core which provides easy access to the mounting margin and neck damper
  • The removable snap-in center cores are interchangeable between same size margins
  • The standard finish is White (WH) for M Steel, fixed pattern, square/rectangular neck diffuser
Back to Top

M Steel, fixed pattern, square / rectangular neck

  • Product Application
  • Features
  • Benefits
  • Product Documentation
  • Related Products

    Product Application

    Spaces that see heavy foot traffic require diffusers that can handle the constant internal climate changes and also be long lasting. Our M diffuser line is the perfect solution. With a sturdy steel construction and a one-piece removable center core, this product offers a range of air patterns, sizes, and mounting methods that make installation easy and usage versatile.
    Product Application

    Features

    • The outer margin matches the size and style mentioned in the project plans and schedules
    • Individual louvers are equipped with a horizontal lip to create a tight ceiling air pattern even at reduced air flows
    • Available accessories include Steel Opposed Blade Dampers (SMOBD), Aluminum Opposed Blade Dampers (AMOBD), Steel Plaster Frames (SMF), Aluminum Plaster Frames (ASMF), and Square to Round Adapters (SRM). Trim frames and dampers are ordered separately and shipped loose for field installation
    • Minimum neck sizes are 6” x 6” and 12” x 12”, and maximum neck sizes are 9” x 9”, 21” x 21” and 45” x 21”
    • A square or rectangular inlet will be an integral part of the margin assembly. The inner louver assembly will be flush with the outer margin with a 1, 2, 3, or 4-way directional pattern
    • The manufacturer will provide published performance data tested in accordance with ANSI/ ASHRAE Standard 70-1991
    • The damper (SMOBD - Steel, AMOBD - Aluminum) is operable from the diffuser face without the need of removing the spring-loaded inner core assembly

    Benefits

    Elegant And Efficient
    Elegant and Efficient

    With a superior construction and streamlined flush appearance, this diffuser offers exceptional durability and design.

    Technical Resources

    Document Name
    Description
    Language
    Resource Type

    Data Sheet

    CD~MSERIES_FEA4_09 (English)

    M-Series Louvered Face-Square Neck - Ceiling Diffusers, Louvered Face-Square Neck M, MA, AM, AMA - Features

    English Data Sheet
    VIEW

    Data Sheet

    CD~MSERIES_DIM4_09 (English)

    MZ, AM, MO, AMA, MA, AMZ, AMO, M - Product Dimensions

    English Data Sheet
    VIEW

    Engineering Guide

    CD~MSERIES_ENG4_09 (English)

    MZ, AM, MO, AMA, MA, AMZ, AMO, M - Engineering Data

    English Engineering Guide
    VIEW

    Specification Guide

    CD~MSERIES_SPC4_09 (English)

    M-Series Louvered Face-Square Neck - M, MA, AM, AMA - Specifications

    English Specification Guide
    VIEW

    Engineering Guide

    CD~MSERIES_PAT4_09 (English)

    M, MA, AM, AMA, MZ, MO, AMZ, AMO - Deflection Patterns

    English Engineering Guide
    VIEW

    Submittal

    SD-1788 (English)

    Square/Round Diffusers - M-Series Fixed Pattern Square/Rectangular Neck Steel and Aluminum - Submittal

    English Submittal
    VIEW

    Submittal

    SD-1792 (English)

    Square/Round Diffusers - M-Series Frame D2 (2-1/2 drop) Steel Construction - Submittal

    English Submittal
    VIEW

    Specification Guide

    Mseries (English)

    MZ, AM, MO, AMA, MA, AMZ, AMO, M - Specifications Text File

    English Specification Guide
    VIEW

    Revit File

    M_AM (English)

    M, AM - Revit File

    English Revit File
    VIEW
    No resource found for selected filter

    Back

    Next

    Related Products

    SMOBD Steel, Opposed Blade Damper for M-Series

    SMOBD Steel, Opposed Blade Damper for M-Series

    AMOBD Aluminum, Opposed Blade Damper for M-Series

    AMOBD Aluminum, Opposed Blade Damper for M-Series

    MA Steel, adjustable pattern, square / rectangular neck

    MA Steel, adjustable pattern, square / rectangular neck

    AMA Aluminum, adjustable pattern, square / rectangular neck

    AMA Aluminum, adjustable pattern, square / rectangular neck

    AM Aluminum, fixed pattern, square / rectangular neck

    AM Aluminum, fixed pattern, square / rectangular neck

    SMF/ASMF Steel & Aluminum Plaster Frames

    SMF/ASMF Steel & Aluminum Plaster Frames

    SRD, SRM, SRR Square to Round Adapters

    SRD, SRM, SRR Square to Round Adapters

    Contact Us
    Find a Rep
    • Grilles & Registers
    • Square/Round Diffusers
    • Perforated Diffusers
    • Linear/Slot Diffusers
    • Plenum Slots
    • Security Grilles
    • Critical Environment
    • Specialty Products
    • UnderFloor Products
    • Accessories
    • Air Handling Coils
    • Terminal Units
    • Displacement Diffusers
    Products and Solutions
    • Grilles & Registers
    • Square/Round Diffusers
    • Perforated Diffusers
    • Linear/Slot Diffusers
    • Plenum Slots
    • Security Grilles
    • Critical Environment
    • Specialty Products
    • UnderFloor Products
    • Accessories
    • Air Handling Coils
    • Terminal Units
    • Displacement Diffusers
    • Training
    • Webinars
    Services and Support
    • Training
    • Webinars
    • Engineering Resources
    • Installation Manuals
    • Revit
    • Product Catalog
    Resources
    • Engineering Resources
    • Installation Manuals
    • Revit
    • Product Catalog
    Connect With Us
    • Twitter X logo
    • Facebook logo
    • LinkedIn logo
    © 2025 Air Distribution Technologies, Inc..
    • Terms and Conditions of Sale
    • Privacy Notice
    • California Notice at Collection
    • Ethics
    • Terms of use
    • Purchase Terms