Name: PU Air Duct Suppliers and Manufacturers - China Factory - UNT Duct
Brand: UNTDuct
SKU: 305595307

Thanks to its excellent products and quality services, UNT Duct is one of the leading pu air 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.

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PU Air Duct

PU Air Duct is pre-insulated air duct panel with rigid PU foam core and double-sided aluminum foil lamination. Its thermal conductivity hits 0.018–0.022 W/m·K, lightweight and airtight, no secondary insulation needed. It serves HVAC ventilation, features low heat loss, moisture-proof and easy installation, ideal for commercial, industrial and cold chain projects.

Structure: Silver Aluminum/ PU Foam/ Silver Aluminum
Size: 4000*1200*20mm
Foam Density: 50kg/m3
Aluminum Thickness: 0.06mm or 0.08mm
Aluminum Color: Silver
Packing: 10 sheets/ package
Loading Capacity: 710 sheets/ 40'HQ (packed with plastic bags)
660 sheets/ 40'HQ (packed with cardboard box)

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The UNTDuct PIR System: Redefining Air Distribution Excellence

More than just pre-insulated aluminum panels, the UNTDuct System is a comprehensive solution - complete with precision-engineered accessories, specialized machinery, purpose-built tools, and expert know-how - ensuring flawless construction and installation.

Panels:

High-performance sandwich panels featuring rigid polyurethane (PU) or polyisocyanurate (PIR) insulation or Phenolic Foam, fully clad with durable aluminum sheets for superior duct construction.

Accessories:

Flanges, section bars, and specialized fittings designed for seamless duct joining and installation.

Equipment:

State-of-the-art bending machines and manual tools, enabling professional fabrication and installation-whether in a fully equipped workshop or directly on-site.

Know-How:

Unmatched technical and commercial support for consultants and contractors, ensuring optimal system performance.

Engineered for efficiency, durability, and simplicity, the UNTDuct System delivers unparalleled performance in every application.

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Material Performance of PU Air Duct

The PU duct uses hard polyurethane closed-cell foam as the core material, with a double-sided aluminum foil protective layer. The core physical indicators are industry-leading.

Firstly, in terms of insulation performance, the thermal conductivity of PU foam is only 0.018~0.024 W/(m・K), compared with XPS extruded board's 0.028~0.035 W/(m・K) and glass wool's 0.047 W/(m・K), under the same insulation effect, a 25mm PU board is equivalent to a 45mm glass wool board and a 40mm XPS board. The heat loss of the air conditioning pipeline can be controlled within 2%, and the energy consumption of the unit can be reduced by 12% to 18% over the long term.

Secondly, in terms of moisture resistance and waterproofing, the closed-cell rate of PU is ≥ 90%, and the 24-hour absorption rate is only 1.9%, which is much lower than the 35% absorption rate of ordinary rock wool ducts. In humid scenarios such as coastal areas, kitchens, and swimming pools, mold will not grow, and the insulation layer will not fail. The theoretical service life can reach 25 years, while traditional iron sheet-encased insulation ducts only have a lifespan of 10 to 15 years.

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Construction and Installation of of PU Air Duct

The traditional galvanized iron sheet ducts require three steps: cutting and beading, external glass wool insulation, and sealing with adhesive tape. The labor and material costs are high.

The PU prefabricated insulation duct is integrated and formed in one step, with its own insulation layer, eliminating the need for a secondary insulation process.

Weight comparison data: For a 300mm diameter duct, the iron sheet weighs 8-10kg per meter, while the PU duct weighs only 2-3kg. A single person can handle and install it, eliminating the need for heavy climbing equipment, reducing labor costs by over 40%. The sealing performance is remarkable. PU uses the same source foam adhesive for splicing, filling seamlessly, with a leakage rate of less than 2%; the iron sheet flange duct has approximately 200 joints for 500 meters, with a leakage rate generally ranging from 10% to 15%, directly increasing the air conditioning load.

the panels can be cut into custom-shaped elbows and diameters on-site, reducing the prefabrication processing steps, with the construction waste loss rate controlled within 3%, and the iron sheet duct's waste loss can reach 12%. For large commercial complexes and factory projects, the comprehensive construction cost can be reduced by 25% to 30%.

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Why choose UNTDuct

UNT Pre-insulated Ductwork

What is UNT Duct System

UNT Duct System

PRE-INSULATED DUCT vs G.I. DUCTWORK

Metric	20mm PU Pre - Insulated Duct (with 0.08mm Alu. Foil, )	0.5mm G.I Duct + 30mm Rubber Plastic (40-90kg/m³)
Fire Safety	Compliant (Class 0/BS 476, AS 1530.3). Self-extinguishing PU core, low toxic smoke, non-combustible alu foil.	G.I non-combustible; rubber plastic fire-retardant but requires coating to meet strict codes.G.I
Thermal Insulation	Excellent. λ=0.020 W/m·K, no thermal bridging. 20mm integrated structure ensures consistent insulation.	Fair. λ=0.035 W/m·K, thermal bridging at G.I joints. 30mm insulation offset by metal conductivity.
Hygiene & Air Quality	Superior. Non-porous alu foil, smooth inner surface, moisture-resistant PU. Meets cleanroom/hospital standards.	Poor. Porous rubber plastic traps dust/mold; G.I-insulation gaps breed pathogens.
Lightweight	1.4-1.5 kg/m². Ultra-light, reduces structural load; ideal for retrofits/timber-framed buildings.	5.1–6.3 kg/m². Heavy G.I base + bulk insulation; requires reinforced supports.
Energy Efficiency	Excellent. 20–30% lower HVAC energy consumption. Minimizes heat gain/loss in conditioned air.	Low. 20–30% higher energy loss due to inferior insulation and thermal bridging.
Ease of Construction	Easy. Factory-prefabricated tongue-and-groove joints. No separate insulation step; 40–60% less labor time.	Complex. Two-step on-site process: G.I duct fabrication + rubber plastic wrapping. Labor-intensive, prone to gaps.
Quiet Operation	Good. PU core absorbs 10–15 dB airflow noise; alu foil dampens vibration.	Fair. Rubber plastic provides basic sound reduction, but G.I vibration and insulation gaps reduce efficiency.
Space Savings	Excellent. 20mm total thickness (all-in-one). Fits tight ceilings/retrofit cavities.	Poor. 30.5mm total thickness (0.5mm G.I + 30mm insulation). Bulky, requires larger installation space.
Environmental Friendliness	Balanced. CFC/HCFC-free PU, recyclable alu foil. 20–30-year lifespan; net carbon positive in 1–3 years.	Low. Rubber plastic non-recyclable; 10–15-year lifespan. Frequent replacement increases waste; higher energy emissions.
Air Leakage	Superior. ≤2% air leakage (EN 1507, AS/NZS 3660.1). Airtight factory joints + alu foil vapor barrier.	Poor. 5–10% air leakage. On-site sealing gaps; separate vapor barrier required.

Performance comparison based on UNT Duct product data and standard system configurations. Actual performance may vary depending on system design, installation method and project conditions.

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