Jet Diffuser

Construction of Long-Throw Spherical Jet Diffuser

To achieve long-distance and highly focused airflow, the Jet Diffuser is engineered with a specialized geometry and material structure. Understanding its construction helps engineers and project owners select the most suitable solution for each application.

Circular Design with Spherical Core Diffusion

Jet Diffusers feature a circular outer frame with an internal spherical core, which is the key component enabling precise airflow direction. As air passes through the spherical core, it is compressed and projected forward, forming a strong and concentrated air jet.

Key design features include:

• Fixed outer frame for stable mounting on ceilings or walls

• Adjustable spherical core allowing multi-directional airflow control

• Rear duct connection via circular spigot or square flange

Common Manufacturing Materials

Material selection directly affects durability and performance:

• Powder-coated aluminum: lightweight, corrosion-resistant, ideal for high-end projects

• High-grade ABS plastic: cost-effective, good thermal resistance, widely used in residential and light commercial buildings

• Galvanized steel: durable but heavier, suitable for stable industrial environments

Premium versions may include marine-grade anti-corrosion coatings or materials suitable for chemically aggressive environments.

Operating Structure and Airflow Adjustment Angle

The internal spherical core can rotate approximately 30–60 degrees in both horizontal and vertical directions, allowing:

• Flexible airflow direction to adapt to layout changes

• Concentrated or diffused air supply depending on usage requirements

• Elimination of dead air zones in complex or large spaces

This adjustability makes spherical jet diffusers ideal for applications requiring precise air distribution control.

Air Diffusion Mechanism and Operating Principle

Air Jet Diffusion Principle

Jet Diffusers operate on the principle of high-velocity air jet projection, enabled by the spherical core design. When air flows through the diffuser:

• Air is compressed at the diffuser throat

• Released as a high-velocity, focused jet

• Maintains momentum over long distances before diffusing

As a result, airflow throw distances can reach 10–25 meters, depending on system pressure and discharge angle.

Achieving Long Throw Performance

Long-throw efficiency is ensured through:

• Gradually expanding outlet geometry for air acceleration

• Spherical core minimizing turbulence and energy loss

• Adjustable discharge angle from 0–60 degrees

Adequate static pressure at the duct inlet is essential and must be properly calculated to maintain discharge velocity.

Practical Applications of Jet Diffusers

Industrial Buildings, Sports Halls, Airports, Shopping Malls

These spaces typically feature:

• Ceiling heights of 4–12 meters

• Large air distribution zones

• Requirements for even airflow with low noise levels

Jet Diffusers enable:

• Effective delivery of conditioned or fresh air to occupied zones

• Reduction of stagnant air regions

• Improved HVAC efficiency and system performance

Typical applications include:

• Sports arenas: mounted on domed ceilings directing air to seating areas

• Factories: installed at high levels to avoid dust while supplying air to work zones

• Airports: arranged along check-in halls to relieve stuffiness

Why Jet Diffusers Are Ideal for High Ceilings

Compared to conventional diffusers, Jet Diffusers:

• Prevent cold air dumping directly onto occupants

• Require fewer units due to long throw capability

• Reduce system load by directing air precisely where needed

This results in lower installation density and reduced overall HVAC costs.

Selection Criteria for Jet Diffusers

Based on Area and Ceiling Height

Jet Diffusers are most effective when:

• Ceiling height exceeds 4 meters

• Required air throw distance is greater than 10 meters

• No significant obstructions interfere with airflow

Typical size recommendations:

• Ceiling 4–6 m: Ø160–Ø200 mm

• Ceiling 6–8 m: Ø250–Ø315 mm

• Ceiling >8 m: Large-size jet diffusers arranged in a sparse layout

Airflow Rate and Application Requirements

Key airflow parameter: CFM (Cubic Feet per Minute)

Application-based guidance:

• Fresh air supply: lower airflow, gentle discharge

• Air conditioning supply: strong, accurately directed airflow

• Industrial process ventilation: stable, concentrated air jets

Incorrect sizing or layout may cause:

• Air impingement on walls

• Fan overload

• Formation of dead air zones

Choosing the Right Type for Each Project

For best results:

• Conduct on-site airflow assessment

• Review manufacturer technical catalogues

• Compare performance data before final selection

Long-throw jet diffusers are not only an effective air distribution solution but also a key factor in optimizing HVAC operating costs for large-scale buildings. Proper understanding of their construction, operating principles, and application ensures accurate selection and long-term system reliability.