Name: Square PU Air Duct Sheet Suppliers and Manufacturers - China Factory - UNT Duct
Brand: UNTDuct
SKU: 308554528

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

Square PU Air Duct Sheet

Square PU Air Duct Sheet is a modern, pre-fabricated composite panel used primarily for constructing air conditioning and ventilation (HVAC) ductwork. It is designed to be a high-performance, energy-efficient alternative to traditional metal ducts.

Composition and Structure

The sheet has a "sandwich" structure, combining an insulating core with strong outer layers:

Core Material: The core is made of rigid polyurethane (PU) foam. This foam is typically closed-cell, providing excellent insulation and moisture resistance while being free of CFCs and HCFCs for environmental friendliness.

Outer Layers: The foam core is bonded on both sides with protective layers, usually embossed aluminum foil. The standard thickness for the foil is 80 microns for internal use, but thicker foils or pre-painted galvanized steel sheets can be used for higher durability in external applications.

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Advantages of Square PU Air Duct Sheet

Square PU Air Duct Sheets offer several significant benefits compared to traditional galvanized steel ducts :

Energy Efficiency:

The PU foam core has a very low thermal conductivity (around 0.02 W/m·K), which minimizes thermal loss and reduces energy consumption for air conditioning systems . This can lead to overall energy savings of 15-30%.

Lightweight & High Strength:

The panels are much lighter than metal ducts (about 1/3 to 1/2 the weight), which reduces the load on a building's structure and makes them easier to handle and install.

Integrated Insulation:

The insulation is built directly into the panel, eliminating the need to wrap the duct after installation. This saves labor and material costs.

Leak-Free & Durable:

When properly installed with specialized sealing, these ducts have a very low air leakage rate (as low as 2%). They are also resistant to corrosion and mold, boasting a service life of 15-25 years.

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Main Production Process of Square PU Air Duct Sheet

1. Raw Material Mixing

2. Aluminum foil embossing

3. PUR Foam Injection

4. Foaming & Laminating

5. PID Panels Cutting

6. pID Panels auto-stacking

7. Packing of pID Panels

8. Stocking of PID panels

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How to fabricate Polyurethane (PU) pre-insulated Straight Duct

1. marking

2. Cutting

3. Applying Glue

4. Folding

5. taping

6. Applying Profiles

7. Applying Silicone Sealant

8. Reinforcement

Why choose UNTDuct

UNT Pre-insulated Ductwork

Project Case of UNT Ductwork

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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