Adjustable Linear Slot Air Diffuser

Key Technical Specifications

Frame and Blade Thickness Standards

• Frame thickness: 0.8 mm – 1.2 mm
  Ensures sufficient rigidity for long-term installation and operation.

• Air blade thickness: 0.5 mm – 1.0 mm
  Provides flexible airflow adjustment while maintaining stability under high airflow conditions.

Effective Area and Airflow Capacity

According to HVAC design standards, linear slot diffusers typically achieve an effective area of 50%–70% of the total installation cross-section. This results in:

• Uniform air distribution without airflow loss through inactive areas

• Optimized air pressure, contributing to reduced energy consumption for fans and air-conditioning systems

Airflow capacity:
Typically ranges from 150 to 500 m³/h, depending on:

• Number of slots (1, 2, 3 slots, or more)

• Diffuser length

• Internal blade configuration

Construction and Materials of Linear Slot Diffusers

Frame, Blades, and Directional Slots

A linear slot diffuser consists of three main components:

• Outer frame:
  Defines the overall structure, commonly made from extruded aluminum A6063-T5 or stainless steel.
  Frame thickness: 0.8 – 1.2 mm, providing rigidity while remaining lightweight for easy installation.

• Air blades:
  The key component for airflow direction control.
  Typically designed with a triangular profile to enhance aerodynamic performance and maintain quiet operation.
  Blade thickness: 0.5 – 1.0 mm.

• Air slots:
  Narrow, elongated openings that enable smooth and uniform airflow distribution.
  Available in 1-slot, 2-slot, 3-slot configurations, or modular combinations depending on space and airflow requirements.

Common Materials and Surface Finishing

Commonly used materials include:

• Extruded aluminum: Lightweight, durable, and resistant to oxidation in humid environments

• Stainless steel: Used in industrial or special environments requiring enhanced corrosion resistance

Surface finishing is typically white powder coating, which:

• Reduces dust adhesion

• Simplifies cleaning and maintenance

• Matches standard ceiling finishes

Custom color coating is also available to ensure full integration with interior design concepts.

Accessories – OBD Dampers and Modular Connections

One of the advantages of linear slot diffusers is their flexibility in accessory integration, most notably:

• OBD (Opposed Blade Damper):
  Installed behind the diffuser to regulate airflow volume and facilitate HVAC system balancing.

• Modular connection joints:
  Enable multiple diffusers to be joined into a continuous linear run, ideal for corridors or large open spaces while maintaining a seamless aesthetic.

Practical Applications of Linear Slot Diffusers

Beyond technical performance, linear slot diffusers are highly valued for their versatility across various building types:

• Office buildings:
  Provide even air distribution with low noise, ideal for focused working environments.

• Hotels and resorts:
  Offer superior comfort through adjustable airflow and refined, unobtrusive design.

• Shopping malls and showrooms:
  Meet high aesthetic demands, require minimal maintenance, and occupy minimal visual space.

• Hospitals and clean rooms:
  Precise airflow control supports environmental quality and indoor air standards.

A key advantage across these applications is the ability to flexibly serve both supply and return air, which many conventional diffusers cannot achieve effectively.

Selection and Installation Guidelines

Selection Criteria Based on Airflow and Space

Key factors to consider include:

• Room area and ceiling height:
  Larger spaces require longer diffusers or multiple slots for even air distribution.

• Required airflow rate:
  Calculated according to HVAC standards (CFM or m³/h).

• Installation type:
  Recessed ceiling, exposed ceiling, or wall-mounted installation determines flange and airflow direction selection.

• Aesthetic requirements:
  Frame thickness, finish color, and visibility must align with interior design.

Important questions before selection:

• Is the diffuser for supply air or return air?

• Is there an existing recessed ceiling opening?

• Is an OBD damper required for airflow balancing?

Installation Methods

Ceiling Installation (Gypsum Board)

• Prepare ceiling opening according to diffuser dimensions

• Install mounting frame and secure using screws or brackets

• Use rubber gaskets or vibration-isolating materials to minimize noise

Wall Installation

• Commonly used for return air

• Ensure precise alignment with duct connections to prevent air leakage

Practical Tips:

• Always check system pressure balance after installation to avoid backflow

• Avoid reversing supply and return diffuser orientation, as slot designs may differ slightly

Modular Connection and Vibration Control

• Use manufacturer-approved modular connectors for extended linear runs

• Apply technical sealant or silicone at joints to prevent air leakage

• Use rubber washers or vibration dampers at fixing points to avoid long-term noise issues

• Avoid installing near high-powered fan inlets unless acoustic attenuation is provided

Maintenance and Cleaning

For long-term performance, maintenance every 3–6 months is recommended:

1. Carefully remove the frame and blades using a screwdriver

2. Clean surfaces with a soft cloth; avoid aggressive cleaning agents

3. Inspect blades for misalignment or stiffness

4. Reinstall components correctly and verify blade movement

5. For units with OBD dampers, recheck damper settings to maintain airflow balance

Conclusion

The adjustable linear slot air diffuser is an optimal solution for projects requiring stable airflow distribution, precise directional control, and high aesthetic standards. With modern slot design, durable materials, and extensive customization options, it is increasingly adopted across residential, commercial, and institutional buildings. Proper selection, correct installation, and regular maintenance are essential to ensure long-term efficiency and performance.