Name: Pre-Insulated Aluminium Ducting Suppliers and Manufacturers - China Factory - UNT Duct
Brand: UNTDuct
SKU: 312041495

Thanks to its excellent products and quality services, UNT Duct is one of the leading pre-insulated aluminium 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.

Pre-Insulated Aluminium Ducting

Pre-insulated aluminium ducting is a high-performance sandwich panel system for HVAC air distribution. Featuring a rigid foam core (PIR/PU) laminated between aluminium foil facings, it integrates structural support, thermal insulation and vapour barrier in one factory-made sheet. Lightweight, corrosion-resistant and energy-efficient, it significantly reduces installation time and operating costs compared to traditional ductwork.

Structure: Silver Aluminum/ PIR Foam/ Silver Aluminum
Size: 3950*1200*20mm
Foam Density: 50-55kg/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)

Core Structure of Pre-Insulated Aluminium Ducting

The pre-insulated aluminium ducting adopts a sandwich core composite structure:

The outer layer: Both sides are made of high-strength aluminium foil or aluminium sheet, with a thickness of typically 60-80 microns (pressed and treated), and the surface is coated with weather-resistant and anti-corrosion epoxy paint.

The core layer: The middle part is closed-cell rigid foam insulation material, with mainstream materials including PIR (polyisocyanurate), PUR (polyurethane), or phenolic foam. The foam density is approximately 40-55 kg/m³, and the closed-cell ratio is over 95%.

Standard specifications: The panel size is usually 3950mm×1200mm, with a thickness of 20mm (customizable from 10-40mm).

Each functional layer is formed through a one-time composite process in the factory, forming a complete system that integrates ventilation performance, insulation performance, and structural stability.

Send Inquiry

Sealing and Fire Safety Performance of Pre-Insulated Aluminium Ducting

The thermal conductivity of PIR foam is as low as 0.018-0.022 W/(m·K), far superior to XPS ducts (0.030-0.035) and glass wool (0.035 W/(m·K)).

1. Excellent Sealing and Low Air Leakage Rate

The factory-prepared interface design is tight, and it is combined with special sealing components. The air leakage rate can be controlled within 2% (much lower than the 8%-15% air leakage rate of traditional ducts). The Kingspan KoolDuct system can even reduce air leakage by up to 80%, significantly reducing the cooling and heating loads and operating energy consumption.

2. Excellent Fire Safety Performance

PIR foam has self-extinguishing properties. When exposed to fire, a carbonized layer forms on the surface of the foam, effectively blocking the spread of flames, and it does not release black toxic smoke during combustion. The product's fire resistance rating can reach BS476 Part 6&7 Class 0 or GB 8624 B1 level.

Send Inquiry

Installation efficiency and construction advantages of Pre-Insulated Aluminium Ducting

Aluminum is a recyclable and reusable environmentally friendly material. After being discarded, it can be recycled and reused, meeting the development needs of green buildings and low-carbon environmental protection.

The pre-insulated aluminum duct shows significant advantages in the installation stage:

Process simplification: Traditional galvanized iron sheet ducts require two processes of "metal processing + on-site insulation wrapping", while the pre-insulated duct only needs one fixed installation process.

Efficiency improvement: The installation efficiency is 3-5 times that of traditional ducts. A 1000㎡ project can be completed in 3-7 days (traditional ducts require 15-20 days). The labor cost can be reduced by approximately 40%.

On-site adaptability: The sheet can be easily cut and processed on-site, meeting complex design requirements. It is sensitive to on-site environmental conditions and is not affected by weather and other factors.

Send Inquiry

Why choose UNTDuct

UNT Pre-insulated Ductwork

Project Case of UNTDuct

Project Case

Specification

Item	Unit	Specification
Standard Panel Size	mm	3950x1200x20
Alu. Foil Thickness	mm	0.06 or 0.08
Foam Density	kg/m³	50-55
Fire Safety (BS476Part 6&7)		Class 0
Thermal Conductivity	W/(m·K)	0.020
Compressive Strength	MPa	0.2
Bending Strength	MPa	2
Water Absorption	%	0.36
Dimension Change	%	0.3
Working Temperature	℃	-60 to +80
Max Pressure in duct	Pa	1500
Maximum Allowable Wind Velocity	m/s	≤15
Max Continuous Running Temperature	℃	≤70
Lifespan of PIR Air Duct	years	>20

PRE-INSULATED DUCT vs G.I. DUCTWORK

Metric	20mm PIR 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 PIR 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 PIR. 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. PIR 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 PIR, 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 PIR 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.

Need the complete fabrication solution?

UNT Duct supplies PIR duct panels, fabrication tools, jointing accessories, reinforcement components and related materials for complete pre-insulated duct fabrication.

Contact now