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Front view of a black 18-inch 1-slot linear diffuser with 25mm openings for high airflow in commercial HVAC systems
Side view of a black 18-inch 1-slot linear diffuser with 25mm openings for high airflow in commercial HVAC systems
Back view of a black 18-inch 1-slot linear diffuser with 25mm openings for high airflow in commercial HVAC systems
Another side view of a black 18-inch 1-slot linear diffuser with 25mm openings for high airflow in commercial HVAC systems
Face dimensions of a black 18-inch 1-slot linear diffuser with 25mm openings for high airflow in commercial HVAC systems
Neck dimensions of a black 18-inch 1-slot linear diffuser with 25mm openings for high airflow in commercial HVAC systems
Frame height of a black 18-inch 1-slot linear diffuser with 25mm openings for high airflow in commercial HVAC systems
Full dimensions of a black 18-inch 1-slot linear diffuser with 25mm openings for high airflow in commercial HVAC systems
Linear Slot Diffuser high flow 1-slot submittal
Linear Slot Diffuser high flow 1-slot installation submittal

18" Linear Slot Diffuser Vent Cover (1 Slot with 25mm Opening) - Matte Black - FLO-MATRIX HVAC

FWASD25-1/81W/484L/005
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$35.44 CAD
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$35.44 CAD
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Details


This 18" linear slot diffuser features a sleek matte black finish and is built for durability with solid extruded aluminum, making it ideal for HVAC and architectural projects. Perfect for general air distribution and VAV systems, its 25mm slot width with adjustable blades allows a 180° airflow pattern, boosting airflow by up to 14% compared to our 19mm models while reducing static pressure by 18%. This ensures better efficiency without straining duct pressure. For performance details on flow rate, noise, and static pressure—all critical for HVAC compatibility—review our lab data in the performance section. Check our smoke test video to see airflow performance in action. Professional installation is recommended.

 

  • Sleek, Modern Profile: Designed with a crisp 18" x 2" nominal size and a defined 1" (25mm) opening for a minimalist aesthetic. (Detailed dimensions are in the diagram).
  • Engineered for High-Capacity Airflow: Features a wider slot opening, a significant increase over the standard 19mm size. This design allows for a greater volume of air to pass through efficiently, making it ideal for high-demand commercial HVAC systems.
  • Keep Ceilings Clean: Integrated sealing prevents escaped air, which stops ugly dust marks from forming on your ceiling and directs air efficiently.
  • Built for Professional Use: Constructed with heavy-gauge 6063-T5 aluminum, fortified Tig welds, and a chip-resistant powder coat for unwavering reliability.
  • Sophisticated Matte Black: Finished in a premium matte black powder coat that is as durable as it is stylish, offering superior protection against wear.
  • Streamlined, Invisible Install: Enjoy a flawless finish with no visible screws; mounting is handled discreetly on the interior edges. (Hardware not included).
  • Customizable HVAC Integration: For ideal performance, combine with a matching plenum box (sold separately) designed for your specific needs. Watch our intro video.
  • Fast Shipping to Your Door: Orders ship quickly from North America (Vancouver, Canada) and reach US addresses in just 2-7 business days.

 

Full dimensions of a black 18-inch 1-slot linear diffuser with 25mm openings for high airflow in commercial HVAC systems


Performance

 

Performance Data

Flow Rate (CFM)

 Static Pressure (in.wg) Noise Level (NC)

65
103
136

0.09
0.21
0.37

20
30
40

  * Flow rate (CFM) and static pressure (in.wg) are interrelated. It is crucial to know your HVAC system total or static pressure when choosing the proper GRD for optimal performance.

 


Submittal

 

Click here to download a high resolution of this submittal sheet

 

Linear Slot Diffuser high flow 1-slot submittal

 

Linear Slot Diffuser high flow 1-slot installation submittal



Resources

 

Our Guide to 19mm VS. 25mm Slot Width Differences

 

Linear Slot Diffusers: The Smart Choice for Modern HVAC Systems

 

Why 6063-T5 Aluminum is the Gold Standard for Your Linear Slot Diffuser

 

CFD Airflow Analysis Services for Smarter HVAC Design

 

The Hallmarks of a True Commercial-Grade Grille, Register, or Diffuser

For architects and engineers, "commercial grade" signifies a product backed by robust technical documentation that enables accurate system design. This essential data encompasses the full material specification and verified performance metrics, including detailed acoustical data (NC levels), pressure drop, and airflow rates.

Our commitment to this standard is verified through rigorous independent testing per ADC1062:GRD-84 and ASHRAE 70-2006. Furthermore, we employ advanced computational fluid dynamics (CFD) in our design process to enhance energy efficiency and optimize air dispersion performance.

With a legacy dating back to 1997, we have built our reputation on manufacturing premium linear slot diffusers (1-12 slot configurations) for demanding commercial environments. For assistance with your specific project requirements, reach out to our product experts at +1-604-437-1527.

 

Videos

 

Showcase Video of Product - 1 Slot Linear Diffuser

 

Demonstration of airflow direction adjustment - 1 Slot Linear Diffuser

 

How to insert a linear slot diffuser into a plenum

 

Linear Slot Diffuser Smoke Test (Vertical Throw) Video - 1 Slot

 

Linear Slot Diffuser Smoke Test (Horizontal Throw) Video - 1 Slot

 

Videos of previous custom plenums

 

 

Our retail store showroom - Greater Vancouver, Canada

Details


This 18" linear slot diffuser features a sleek matte black finish and is built for durability with solid extruded aluminum, making it ideal for HVAC and architectural projects. Perfect for general air distribution and VAV systems, its 25mm slot width with adjustable blades allows a 180° airflow pattern, boosting airflow by up to 14% compared to our 19mm models while reducing static pressure by 18%. This ensures better efficiency without straining duct pressure. For performance details on flow rate, noise, and static pressure—all critical for HVAC compatibility—review our lab data in the performance section. Check our smoke test video to see airflow performance in action. Professional installation is recommended.

 

  • Sleek, Modern Profile: Designed with a crisp 18" x 2" nominal size and a defined 1" (25mm) opening for a minimalist aesthetic. (Detailed dimensions are in the diagram).
  • Engineered for High-Capacity Airflow: Features a wider slot opening, a significant increase over the standard 19mm size. This design allows for a greater volume of air to pass through efficiently, making it ideal for high-demand commercial HVAC systems.
  • Keep Ceilings Clean: Integrated sealing prevents escaped air, which stops ugly dust marks from forming on your ceiling and directs air efficiently.
  • Built for Professional Use: Constructed with heavy-gauge 6063-T5 aluminum, fortified Tig welds, and a chip-resistant powder coat for unwavering reliability.
  • Sophisticated Matte Black: Finished in a premium matte black powder coat that is as durable as it is stylish, offering superior protection against wear.
  • Streamlined, Invisible Install: Enjoy a flawless finish with no visible screws; mounting is handled discreetly on the interior edges. (Hardware not included).
  • Customizable HVAC Integration: For ideal performance, combine with a matching plenum box (sold separately) designed for your specific needs. Watch our intro video.
  • Fast Shipping to Your Door: Orders ship quickly from North America (Vancouver, Canada) and reach US addresses in just 2-7 business days.

 

Full dimensions of a black 18-inch 1-slot linear diffuser with 25mm openings for high airflow in commercial HVAC systems

Performance

 

Performance Data

Flow Rate (CFM)

 Static Pressure (in.wg) Noise Level (NC)

65
103
136

0.09
0.21
0.37

20
30
40

  * Flow rate (CFM) and static pressure (in.wg) are interrelated. It is crucial to know your HVAC system total or static pressure when choosing the proper GRD for optimal performance.

 

Resources

 

Our Guide to 19mm VS. 25mm Slot Width Differences

 

Linear Slot Diffusers: The Smart Choice for Modern HVAC Systems

 

Why 6063-T5 Aluminum is the Gold Standard for Your Linear Slot Diffuser

 

CFD Airflow Analysis Services for Smarter HVAC Design

 

The Hallmarks of a True Commercial-Grade Grille, Register, or Diffuser

For architects and engineers, "commercial grade" signifies a product backed by robust technical documentation that enables accurate system design. This essential data encompasses the full material specification and verified performance metrics, including detailed acoustical data (NC levels), pressure drop, and airflow rates.

Our commitment to this standard is verified through rigorous independent testing per ADC1062:GRD-84 and ASHRAE 70-2006. Furthermore, we employ advanced computational fluid dynamics (CFD) in our design process to enhance energy efficiency and optimize air dispersion performance.

With a legacy dating back to 1997, we have built our reputation on manufacturing premium linear slot diffusers (1-12 slot configurations) for demanding commercial environments. For assistance with your specific project requirements, reach out to our product experts at +1-604-437-1527.

 

Videos

 

Showcase Video of Product - 1 Slot Linear Diffuser

 

Demonstration of airflow direction adjustment - 1 Slot Linear Diffuser

 

How to insert a linear slot diffuser into a plenum

 

Linear Slot Diffuser Smoke Test (Vertical Throw) Video - 1 Slot

 

Linear Slot Diffuser Smoke Test (Horizontal Throw) Video - 1 Slot

 

Videos of previous custom plenums

 

 

Our retail store showroom - Greater Vancouver, Canada