Name: PU Insulated Air Ducting Suppliers and Manufacturers - China Factory - UNT Duct
Brand: UNTDuct
SKU: 312746157

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

PU Insulated Air Ducting

The PU Insulated Air Ducting 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.

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Compliance Standards and Environmental Attributes of PU Insulated Air Ducting

Safety Compliance: The fire resistance rating reaches non-flammable B1 level. It complies with international standards such as GB 8624-2012 and EN 45545, and the smoke toxicity meets the standards.

Environmental Safety: It does not contain harmful substances such as CFC, formaldehyde, and free benzene. It meets the environmental limit standards for building insulation materials and is green and pollution-free.

Scene Restrictions: It is not suitable for acidic or alkaline environments and smoke exhaust and prevention systems. In high-pressure scenarios, specialized reinforced products need to be selected.

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Specification of PU Insulated Air Ducting

Typical technical data for PU Insulated Air Ducting is as follows:

Property	Typical Specification
Panel Thickness	10, 15, 20, 25, 30, 40 or 42 mm
Panel Size (L x W)	3950 x 1200 mm, 2900 x 1200 mm
Aluminum Thickness	60, 80 microns
Aluminum Sheet Thickness	150-200 microns
Foam Density	40-45 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

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Why choose UNTDuct?

UNT Pre-insulated Ductwork

UNTDuct's Project Case

UNT's products are exported to over 30 countries and regionsworldwide, earning consistent recognition and positive feedback from global clients.

Project Case

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.

How To Make PU Pre-insulated Straight 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 form 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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UNT Duct supplies PU duct panels, fabrication tools, jointing accessories, reinforcement components and related materials for complete pre-insulated duct fabrication

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