| Product Description
The air distribution box, is the core airflow distribution device in a central fresh air system. Installed between the main fresh air unit and the branch pipes serving each room, it acts as a crucial connecting hub. Fresh air delivered by the main unit first enters the distributor. Its internal structure slows down the airflow, converts dynamic pressure to static pressure, and then distributes the stabilized, uniform airflow to each branch, ultimately delivering it to every room. The product is manufactured from high-quality, environmentally friendly materials and features a sealed design, ensuring high system air delivery efficiency and balanced airflow across all branches. It is widely used in residential buildings, villas, apartments, office buildings, and other central fresh air system projects.
| Product Features
● Stabilizes Airflow, Eliminates Turbulence: The distributor's internal volume is significantly larger than the connected pipe diameter. Airflow entering it slows down, converting dynamic pressure to static pressure, effectively eliminating pulsating airflow and turbulent noise from the main unit. This results in smoother, more uniform airflow entering each branch.
● Independent Adjustment, Balanced Airflow: Each branch outlet can be equipped with an independent airflow regulating valve. By finely adjusting the opening of each room's branch, balanced airflow throughout the entire house is achieved. This ensures rooms at different distances from the main unit receive the designed fresh air volume, avoiding the issue of "strong airflow in nearby rooms, weak airflow in distant ones."
● Noise Reduction & Sound Insulation, Enhanced Comfort: The distributor housing is designed with sound-insulating materials or a double-layer structure, effectively blocking the transmission of main unit noise through the ducts into the rooms. Combined with an acoustic liner, it further absorbs airflow noise, creating a quiet and comfortable living environment.
● Flexible Connection, Easy Installation: Distributor outlets feature a socket-type design, allowing direct connection with PE corrugated pipes without adhesive, making construction simple and fast. The housing has multiple pre-set outlets, allowing flexible activation or sealing of outlets based on the floor plan's needs.
● System Compatibility, Multipurpose Box: Products are available in various outlet specifications (DN75, DN90, DN110) and outlet counts (6, 7, 8, 10, 12, 14, 17), adapting to different main unit capacities and floor plan requirements. They are compatible with both ceiling supply and underfloor air supply systems, meeting diverse design needs.
I Technical Specifications
Parameter Item | Specification |
Product Material | Housing: ABS / EPP / Sheet Metal; Liner: Acoustic Foam / Rubber-Plastic Foam |
Main Inlet Specification | DN125, DN160, DN200 (Connects to fresh air main unit) |
Branch Outlet Specification | DN75, DN90, DN110 (Connects to room branch pipes) |
Number of Outlets | 6, 7, 8, 10, 12, 14, 17 (Sheet metal series distributors can be customized) |
Adjustment Method | Manual Dial Adjustment Valve (with scale indicator) |
Sealing Performance | Outlets equipped with gaskets, housing is fully sealed, air leakage rate ≤ 2% |
Installation Method | Concealed in ceiling, or surface-mounted in equipment room |
Applicable Systems | Ceiling Supply Systems, Underfloor Air Supply Systems |
I System Components
Component Category | Main Varieties | Functional Characteristics |
Distributor | ABS, EPP, Sheet Metal | Stabilizes airflow, reduces noise, distributes air volume, allows independent branch adjustment, provides insulation. |
Outlet Adjustment Valve | Manual Iris Damper | Independently adjusts airflow for each branch, enabling on-demand distribution per branch. |
Sealing Accessories | Gasket, End Cap | Ensures airtightness at outlets, adaptable to different pipe diameters. |
(Note: ABS Distributor: Cost-effective; EPP Distributor: Provides thermal insulation and condensation prevention; Sheet Metal Distributor: Adapts to high airflow volumes, meets customization needs.)
| Product Specification
| Application
● Central Fresh Air Systems: In residences, villas, apartments, etc., achieving uniform air supply throughout the house via the distributor, ensuring each room receives the designed fresh air volume.
● Multi-Room Independent Control: Suitable for places requiring independent fresh air volume adjustment per room, such as offices, hotel rooms, school classrooms.
● Large Flats and Duplex Apartments: For floor plans with large areas and many rooms, the distributor effectively solves insufficient airflow in distant rooms.
● Passive Houses: For passive houses with high airtightness requirements, the distributor, combined with its sealed design, ensures low system air leakage.
I Comparison with Traditional Branching Methods
Comparison Aspect | Fresh Air Distributor System | Traditional Tee/Elbow Branching | Direct Series Branching |
Airflow Stability | Excellent, eliminates dynamic pressure and turbulence | Average, high local resistance | Poor, turbulent airflow |
Airflow Balance | Independent branch adjustment, precise balancing possible | No independent adjustment, high flow near source, low at end | No adjustment, severe flow shortage at endpoints |
Noise Control | Built-in acoustic structure, good noise reduction | No noise reduction, noise prone at high-resistance points | Noise propagates along ducts |
Installation Complexity | Centralized installation, clear duct layout | Complex ductwork, many joints | Simple but poor performance |
Air Leakage Risk | Sealed design, low leakage rate | Many joints, high leakage risk | Few joints, but high pressure loss |
Maintenance Convenience | Centralized adjustment, easy inspection | Dispersed adjustment, difficult inspection | Cannot adjust individually |
I FAQ
1. What is Air Distribution Box? What role does it play in a fresh air system?
Air Distribution Box, also known as an air distribution box or plenum box, is the airflow distribution hub of a central fresh air system. Installed between the main fresh air unit and room branch pipes, its main functions include: ① Stabilizing airflow – converting the high-speed pulsating airflow from the main unit into smooth, uniform airflow. ② Distributing air volume – evenly distributing fresh air to each room branch. ③ Noise reduction and insulation – built-in acoustic structure blocks main unit noise transmission. ④ Independent adjustment – achieving balanced airflow throughout the house via branch adjustment valves.
2. What's the difference between Air Distribution Box and directly using tee fittings for branching?
Using tee fittings directly has the following issues: ① High airflow in near rooms, low airflow in distant rooms, difficult to balance. ② High local resistance, prone to turbulent noise. ③ Cannot independently adjust airflow per room. The distributor, through its internal structure, stabilizes airflow. Combined with independent adjustment valves, it enables accurate balancing of each branch, ensuring each room receives the designed airflow. Its noise reduction effect is also significantly better than tee fitting branching.
3. How to choose the appropriate Air Distribution Box specification?
Selection is mainly based on the number of rooms and main unit airflow: ① Number of outlets – determined by the number of rooms requiring supply; recommend reserving 1-2 spare outlets. ② Outlet specification – branch outlets are typically DN75 or DN90, DN110; the main inlet is selected as DN125, DN160, or DN200 based on the main unit's outlet size. ③ Housing dimensions – choose based on available installation space, ensuring sufficient room in the ceiling or equipment room. Refer to the applicable area recommendations in the technical parameters table for specifics.
4. Does Air Distribution Box require maintenance? How often should it be checked?
Air Distribution Box is a low-maintenance component. However, it's recommended to perform a simple check every six months: ① Confirm no looseness or air leakage at connections. ② Check that adjustment valves turn smoothly. ③ If installed in a ceiling, check the hanging rods or brackets are secure. If an adjustment valve is stuck, apply a small amount of dedicated lubricant spray. Under normal conditions, the distributor's lifespan matches the building's and does not require replacement.
5. Do all branch outlets have to be used? How to handle unused outlets?
No, not all outlets need to be used. Distributors are typically designed with multiple outlets to adapt to different floor plans. Unused outlets should be sealed with dedicated sealing caps. When sealing, ensure caps are installed securely with good airtightness to prevent air leakage and system airflow loss. If adding a room later, simply remove the sealing cap and connect the new branch pipe, facilitating easy system expansion.
