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PIR Rectangular Duct
UNTDuct PIR Rectangular Duct is a pre-insulated HVAC duct system manufactured by Xiamen UNT Duct Technology Co., Ltd . It is designed as a high-performance alternative to traditional metal ducts, integrating structure, insulation, and a protective outer layer into a single, lightweight sandwich panel.
| Technical Parameter | Standard Value / Specification |
|---|---|
| Structure | Sandwich panel: Aluminum Foil / PIR Foam / Aluminum Foil |
| Core Material | Polyisocyanurate (PIR) foam |
| Panel Dimensions | 3950mm x 1200mm x 20mm (also available: 2900x1200x20mm) |
| Foam Density | Approx. 52 kg/m³ |
| Thermal Conductivity | ≤ 0.020 W/(m·K) |
| Fire Rating | Class 0 (BS476 Part 6&7) or Class A (ASTM E84) |
| Operating Temperature | -50°C to 120°C |
Key Features and Benefits of PIR Rectangular Duct
The design of this duct system focuses on solving several key challenges in modern building HVAC:
Energy Efficiency:
The PIR foam core has a very low thermal conductivity, which minimizes thermal loss. It can reduce the energy consumption of an air conditioning system by an estimated 25% to 40% compared to uninsulated or traditional systems.
Space-Saving Design:
The rectangular shape is specifically engineered to fit into confined spaces such as ceiling cavities, raised floors, and narrow pipe shafts. This maximizes usable space, especially in commercial buildings and residential complexes.
Enhanced Fire Safety:
PIR foam is inherently fire-resistant. In the event of a fire, it forms a protective char layer that helps inhibit the spread of flames and reduce smoke emission, meeting strict safety standards for occupied spaces like hospitals, schools, and high-rise buildings.
Durability and Hygiene:
The closed-cell structure of the PIR core resists moisture absorption, preventing mold and mildew growth. The smooth inner aluminum surface minimizes air resistance, reduces dust accumulation, and makes the duct easy to clean, contributing to better indoor air quality.
Fast Installation:
The panels are lightweight and arrive at the job site pre-insulated and ready for assembly. This can cut installation time by up to 50% compared to traditional metal ducts, which require separate insulation wrapping, leading to lower labor costs and faster project completion.
certification of PIR Rectangular Duct Panel
Fire Safety, Thermal Conductivity and Physical Performance
BS 476 Part 6&7
ASNZS 1530.3
thermal Conductivity
Compress Strength
CFC HCFC Free
How to make PIR Rectangular Duct
Step 1 - Tracing: outline the duct shapes on the panel.
Step 2 - Cutting: Using manual cutting tools, cut along the panel edges and create 90 degree "V" grooves on the panel.
Step 3 - Gluing: Apply glue to the cutting surfaces of the panels.
Step 4 - Folding: After the glue is cured, fold the sides toward each other to from the straight duct.
Step 5 - Taping: The tape is applied only to the external seams of the duct where the sides of the panel were joined for air-tightness.
Step 6 - Flanging: After applying glue and positioning the steel angle bracket, process to fit the PVC or aluminum invisible flanges.
Step 7 - Reinforcement: reinforce the duct with an aluminum reinforcement bar and G.I. Shaped disks, if necessary.
Step 8 - Sealing: After the duct is assembled, seal all internal joints hermetically with silicone.
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