Thanks to its excellent products and quality services, UNT Duct is one of the leading rectangular pu pre-insulated duct manufacturers and suppliers in China. Welcome to buy the high quality and customized products from our factory. We will offer you the best service and fast delivery.
Rectangular PU Pre-insulated Duct
The rectangular PU pre-insulated duct is a modern, energy-saving alternative to traditional sheet metal HVAC ductwork. Its defining characteristic is a factory-integrated insulation core, which forms a composite panel that serves simultaneously as an air conduit and a thermal barrier.
Constructed as a three-layer sandwich panel, it features a rigid polyurethane foam core with a high-density, closed-cell structure of approximately 45–50 kg/m³, providing both structural integrity and superior insulation. This foam core is permanently bonded on both sides to protective facings, typically 60–80 micron aluminum foil, which ensures a robust, airtight, and moisture-resistant surface. In more demanding exterior applications, the outer facing can be upgraded to a thicker aluminum sheet or pre-painted galvanized steel for enhanced durability.
Key Features and Advantages of Rectangular PU Pre-insulated Duct
Rectangular PU pre-insulated ducts offer clear advantages over traditional metal ducts that require separate, field-applied insulation:
Superior Thermal Insulation – The PU foam core has a very low thermal conductivity (≈0.020 W/m·K), outperforming fiberglass and mineral wool to minimize heat gain/loss and prevent condensation.
Lightweight – Up to 75–80% lighter than galvanized steel, making handling easier, installation faster, and reducing structural load.
Space-Saving – No external insulation layer means wall thickness is just 20–30 mm, saving valuable ceiling or plenum space.
Excellent Air Tightness – Properly sealed joints yield very low leakage rates, enhancing system efficiency and cutting energy waste.
Corrosion & Moisture Resistance – The closed-cell foam does not absorb water, and aluminum facings resist rust, preventing mold and bacteria-ideal for hospitals and pharmaceutical settings.
Faster Installation – Pre-insulated design enables a one-step process, eliminating separate wrapping and vapor barrier steps, reducing fabrication time by 50–70%.
Sound Dampening – The rigid foam core absorbs vibration and reduces fan/airflow noise for quieter operation.
Specification of Rectangular PU Pre-insulated Duct
Typical technical data for Rectangular PU Pre-insulated Ducts is as follows:
| Property | Typical Specification |
|---|---|
| Panel Thickness | 10, 15, 20, 25, 30, 40 or 42 mm |
| Panel Size (L x W) | 4000 x 1200 mm (common), 3950 x 1200 mm, 2900 x 1200 mm |
| Aluminum Thickness | 60, 80 microns |
| Aluminum Sheet Thickness | 150-200 microns |
| Foam Density | 45 kg/m³ |
| Thermal Conductivity | 0.020 W/m·K |
| Closed Cell Rate | >95% |
| Air Leakage Rate | ≤2% |
| Working Temp. | -60°C to 80°C |
| Water Absorption | <0.1% - 0.36% |
| Max. Wind Velocity | ≤ 12 - 20 m/s |
| Life Span | 20+ years |
| Noise Reduction Effect | 15-25 db |
The UNTDuct PU System
Pre-insulated PU Panels:
Closed-cell PU Foam Pre-insulated sandwich panels covered with aluminum foil
Pre-insulated duct Accessories:
Flange, section bar and other accessories for duct joining and installation
Fabrication Tools/ Equipment:
Professional hand tools and automatic machinery;
Know-How:
Specialized training programs for duct manufacturers
How to fabricate Rectangular PU Pre-insulated Duct
- The fabrication process begins by precisely marking the duct panel layout directly on the aluminum-faced PU foam board using a tape measure, marker, and straightedge according to the design specifications.
- Specialized hand tools, including 90-degree straight cutters and V-groove cutters, are then used to cut the panels and create precision 45-degree bevels at all fold lines without cutting through the outer facing.
- A high-quality, polyurethane-compatible adhesive or sealant is applied to the beveled edges and male-female joint surfaces created by the V-cuts to ensure a permanent, airtight bond.
- The panel is then folded along the pre-cut V-grooves to form the rectangular shape, with the adhesive-coated edges coming together to create strong, rigid corners.
- All external longitudinal seams and transverse joints are immediately sealed with high-grade aluminum foil tape, at least 80 microns thick, which is firmly pressed down with a roller for a durable, airtight finish.
- PVC or aluminum corner profiles and flanges are installed on the duct ends to provide structural strength, facilitate connection between sections, and allow for suspension from ceiling supports.
- A final bead of silicone sealant is applied to all interior joints and corners to guarantee complete air-tightness and prevent any moisture ingress or condensation issues.
- For large-scale commercial projects, the entire marking and cutting process can be automated using CNC machines to achieve superior precision, reduce material waste, and increase fabrication speed by over five times.
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