Frameless Linear Air Diffuser

High-Aesthetic Frameless Linear Air Diffuser for HVAC Systems

The frameless linear air diffuser provides uniform and refined air distribution, making it ideal for apartments, offices, hotels, and showrooms. This is an optimal HVAC solution that preserves a seamless and minimalist interior aesthetic.

Key Advantages

• High aesthetics with frameless, seamless design

• Even airflow distribution without uncomfortable drafts

• Customizable length to suit project requirements

• Concealed ceiling or wall installation, space-saving

• Suitable for both supply air and return air

• Quiet operation with low noise levels

• Durable, lightweight, and corrosion-resistant

• Low dust accumulation, easy maintenance

• Suitable for a wide range of modern architectural projects

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What Is a Frameless Linear Air Diffuser?

A Frameless Linear Slot Diffuser is a type of supply and return air diffuser featuring a long, narrow slot design. It is installed flush within ceilings or walls so that the visible surface nearly “disappears” into the interior structure.

Unlike traditional framed diffusers, frameless linear diffusers create a clean, continuous, and minimalist appearance. They are widely specified in high-end projects such as luxury apartments, villas, hotels, and Grade A office buildings where aesthetics are a priority.

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Key Features of Frameless Linear Air Diffusers

Construction of Frameless Linear Diffusers

A standard frameless linear diffuser typically consists of:

• Diffuser body: Extruded aluminum alloy or galvanized steel, rigid and resistant to deformation

• Slots: One to three slots depending on design, ensuring precise airflow direction

• Air deflection blades: Fixed or adjustable to control discharge direction

• Plenum box: Ensures even air distribution, reduces noise, and stabilizes airflow

• Special concealed mounting frame: Allows the diffuser to integrate seamlessly into the ceiling or wall surface, creating a true frameless effect

Operating Principle

Air supplied from a fan, AHU, FCU, or ducted indoor unit enters the plenum box, then is evenly distributed through the linear slots into the occupied space. The airflow is spread thinly along the length of the diffuser, minimizing turbulence, reducing noise, and improving thermal comfort.

Despite its concealed appearance, the frameless linear diffuser fully meets HVAC airflow and velocity requirements.

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Dimensions of Frameless Linear Air Diffusers

Dimensions depend on airflow rate and ceiling design, with some specific considerations compared to framed diffusers.

1. Typical Dimensions

• Length: Commonly from 600 mm to 2400 mm, customizable to project requirements

• Slot width: Typically 20–60 mm for 1–2 slot models; multi-slot designs may reach 80–120 mm

• Frame depth: Approximately 25–35 mm for concealed ceiling installation, shallower than framed diffusers to achieve a hidden effect

2. Important Considerations

• Frameless design: Precise dimensioning is required to avoid gaps or exposed edges

• Flexible customization: Long and narrow form is ideal for gypsum, aluminum, or wooden ceilings

• Limited depth: Excessive depth may expose the internal frame, so depth is usually kept below 35 mm

3. Size Selection Guidelines

• Balance airflow capacity with aesthetics; overly narrow or excessively long slots may affect performance or installation accuracy

• Ensure accurate ceiling cut-out dimensions for a flush finish

• For large projects (offices, hotels, commercial centers), continuous lengths of 1200–2400 mm are commonly used for uniform air distribution

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Types of Frameless Linear Air Diffusers

Common Configurations

1. Single-slot frameless linear diffuser
   Minimalist design, high aesthetics, suitable for apartments and villas with moderate airflow requirements.

2. Two- or three-slot frameless linear diffuser
   Higher airflow capacity and wider air distribution, ideal for large living rooms, meeting rooms, or open spaces.

3. Curved frameless linear diffuser
   Custom-manufactured to follow curved ceilings or architectural features.

4. Combined supply and return linear diffuser
   Designed to function as both supply and return air, optimizing ceiling layout and maintaining a clean appearance.

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Classification of Frameless Linear Diffusers

1. By Design

• Single-slot linear diffuser: Focused airflow, suitable for narrow or small areas

• Double-slot linear diffuser: Wider air spread, common in offices and living areas

• Multi-slot linear diffuser: Gentle and uniform airflow, ideal for large rooms and commercial spaces

2. By Installation Method

• Surface-mounted: Easy replacement and maintenance

• Concealed (recessed): Fully flush with ceiling or wall, maximum aesthetic value

• Wall or floor-mounted: Less common, used in special architectural applications

3. By Airflow Direction

• Single-direction discharge: Controlled airflow in one direction

• Multi-direction discharge: Special blade designs allow 2–4 directional airflow

4. By Functional Features

• With volume control damper: Enables airflow balancing within the HVAC system

• Without damper: Fixed airflow, quick installation, lower cost

• Integrated sensors: Compatible with smart HVAC systems using temperature or CO₂ sensors

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Key Advantages of Frameless Linear Air Diffusers

1. Superior Aesthetics

• Completely hidden frame, seamlessly integrated into ceilings or walls

• Enhances a modern, spacious, and luxurious appearance

2. Comfortable and Even Air Distribution

• Linear airflow pattern reduces high-velocity air jets

• Minimizes turbulence and operational noise

3. Ideal for Premium Interior Design

• Compatible with modern, minimalist, and luxury design styles

• Flexible length customization for architectural alignment

4. High Durability and Low Maintenance

• Aluminum or galvanized steel construction resists corrosion

• Easy to clean, resistant to warping due to temperature changes

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Applications of Frameless Linear Air Diffusers

Frameless linear diffusers are widely used in projects that demand refined aesthetics and consistent airflow performance:

1. Luxury Apartments, Penthouses, and Villas

Provide seamless ceiling integration, maintain interior harmony, and deliver comfortable, evenly distributed air.

2. 4–5 Star Hotels and Resorts

Ensure quiet operation, gentle airflow, and concealed installation to enhance guest comfort and luxury perception.

3. Fashion, Cosmetics, and Furniture Showrooms

Maintain ideal indoor temperature without distracting from product displays or interior design.

4. Grade A Offices and Commercial Buildings

Provide uniform airflow over large areas, improving occupant comfort and productivity while maintaining a professional appearance.

5. Convention Centers and High-End Restaurants

Deliver balanced airflow in large spaces without interfering with lighting, décor, or acoustics.

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Technical Standards and Installation Guidelines

To ensure stable and efficient operation, HVAC engineers should consider:

1. Correct airflow calculation
   Verify airflow per room (CFM or m³/h). Excessive airflow through narrow slots may cause noise.

2. Use of properly sized plenum boxes
   Plenum boxes stabilize pressure and reduce airflow noise. Omission may result in uneven distribution.

3. Accurate positioning and installation
   Avoid condensation-prone areas and ensure straight alignment for aesthetic quality.

4. Coordination with interior finishing
   Frameless mounting frames must be installed before ceiling or wall closure.

5. Post-installation testing

   • Air velocity at diffuser: 1.5–2.5 m/s

   • Noise level: < 35 dB for residential applications

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G-Sora Frameless Linear Air Diffusers for HVAC Systems

G-Sora specializes in supplying high-quality HVAC components, including frameless linear diffusers manufactured to strict technical standards:

• High-grade extruded aluminum: lightweight, durable, corrosion-resistant

• Precision-engineered slots for even airflow and quiet operation

• Custom dimensions according to project drawings

• Compatible with most ceiling systems and interior design solutions

• Matching plenum boxes available

• Professional engineering support for site survey, sizing, placement, and airflow verification

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Frequently Asked Questions

1. Are frameless linear diffusers durable?
Yes. Made from aluminum alloy or galvanized steel, they resist corrosion and deformation, offering long service life when properly installed.

2. Are they suitable for bedrooms?
Absolutely. The gentle, distributed airflow and low noise level make them ideal for bedrooms and quiet spaces.

3. Is installation more complex than standard diffusers?
Yes, as concealed frames must be installed prior to ceiling finishing. However, with coordinated design and installation, the process is efficient and precise.

4. Can custom sizes be manufactured?
Yes. Most projects use customized lengths. G-Sora provides fabrication based on project drawings.

5. Do frameless linear diffusers generate noise?
No, if airflow is correctly calculated and a plenum box is used. Noise typically occurs only when airflow is oversized or slot width is insufficient.

6. Can they be used for return air?
Yes. Many projects use linear diffusers for both supply and return air to maintain a minimalist ceiling design.

7. Is periodic cleaning required?
Yes. Cleaning every 6–12 months is recommended. The design allows easy maintenance with a soft cloth or handheld vacuum.

8. Do they affect ceiling aesthetics?
On the contrary, they enhance aesthetics by creating a seamless, refined, and modern ceiling appearance.

9. Does G-Sora provide site surveys?
Yes. G-Sora engineers support on-site surveys, sizing consultation, airflow verification, and optimal installation solutions.