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PU Pre-insulated Air Duct

Polyurethane (PU) pre-insulated air duct is a modern, energy-efficient alternative to traditional sheet metal ductwork for Heating, Ventilation, and Air Conditioning (HVAC) systems. It is a composite product, typically manufactured as a sandwich panel with a rigid polyurethane foam core and durable facings on both sides.

Panel Structure: Silver Alu. / PU Foam / Silver Alu. Foil
Foam Density: 48kg/cbm
Panel Dimension: 3950mm*1200mm*20mm
Alu. Foil: 0.06mm (Embossed)
Packing: 10 sheets/ Cardboard box

Container Loading:
40'HQ Container:
3950*1200*20mm, 10 sheets packed in one carton, total 660sheets
2900*1200*20mm, 10 sheets packed in one carton, total 880sheets
20'GP Container:

2900*1200*20mm, 10 sheets packed in one carton, total 400sheets.

Key Advantages of PU Pre-insulated Air Duct Over Traditional G.I. Ductwork

PU pre-insulated ducts offer several benefits over traditional galvanized iron (GI) ducts, primarily because they combine structure and insulation in one product.

Excellent Thermal Efficiency:

PU foam has a very low thermal conductivity, typically 0.020 W/m·K . This high efficiency minimizes energy loss, ensuring that heated or cooled air reaches its destination at the desired temperature.

Lightweight and Easy Installation:

These ducts are significantly lighter than traditional sheet metal ducts-up to 72% lighter.This makes them easier to transport, handle, and install, which can reduce labor costs and installation time.

Condensation Control:

The high insulating value of the PU core prevents the outer surface of the duct from reaching the dew point. This effectively stops condensation from forming, which is crucial for preventing mold, mildew, and water damage in humid environments.

Acoustic Performance:

The closed-cell structure of PU foam acts as a natural sound barrier, dampening noise from airflow and equipment. This makes them ideal for noise-sensitive buildings like hospitals, schools, and hotels.

Durability and Hygiene:

The smooth, non-porous aluminum or steel facings create a surface that resists dust accumulation and microbial growth, making it easy to clean and suitable for hygienic environments like hospitals and food processing plants . The durable facings also protect the foam core from mechanical damage.

FAQ of PU Pre-insulated Air Duct

Q: Do these ducts sweat or cause condensation?
A: No, if properly designed and installed. Because the PU foam core has excellent thermal properties, it keeps the outer surface temperature close to room temperature, preventing it from reaching the dew point. This eliminates the need for separate vapor barriers or additional insulation wrapping required for bare metal ducts.

Q: How are the ducts joined together?
A: The most common method is the Flange System. Aluminum channels (flanges) are clipped onto the edges of the cut duct panels. The corners are secured with plastic or metal corner pieces. The sections are then bolted together, often with a foam or rubber gasket between them to ensure an airtight seal.

Q: Can PU ducts be used for high-pressure HVAC systems?
A: PU ducts are rigid and structurally strong, but they are most commonly used in low to medium pressure systems (typically up to 2,000 Pa static pressure). For very high-pressure applications (common in large commercial or industrial settings), reinforced panels (with steel facings) or traditional sheet metal are generally recommended.

Installation and Maintenance of pU Pre-insulated air duct

Fabrication: Ducts are fabricated from panels using simple tools for tasks like cutting, grooving, and folding. The sections are then assembled using accessories like specialized flanges, aluminum tapes, and sealants .

Maintenance: These systems are designed for minimal maintenance. Regular inspections should focus on the tightness of joints and the integrity of the outer facing to prevent air leaks or damage . The inner surface can be cleaned periodically with mild detergents.