Name: PIR Pre-Insulated Aluminium Ducting Suppliers and Manufacturers - China Factory - UNT Duct
Brand: UNTDuct
SKU: 312298236

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

PIR Pre-Insulated Aluminium ducting

PIR Pre-Insulated Aluminium Ducting features a closed-cell PIR foam core sandwiched between aluminium facings. It offers excellent thermal insulation (0.018–0.023 W/m·K), light weight, Class 0/B1 fire rating, and quick installation-an energy-efficient solution for modern HVAC systems.

Structure: Silver Aluminum/ PIR Foam/ Silver Aluminum
Size: 3950*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)

Send inquiry

Building Space and Structural Load of PIR Pre-Insulated Aluminium ducting

Traditional galvanized iron sheet air ducts require additional insulation layers to be added on-site, resulting in heavy overall weight and occupying a large amount of space. PIR prefabricated insulated aluminum air ducts combine the air duct structure with the insulation layer into one, with a unit weight of approximately 1.3–1.4 kg/m² - only 1/6 to 1/10 of the weight of traditional iron sheet air ducts.

This difference is of great significance in high-rise buildings. Every reduction of one kilogram in air duct weight means that the building structure can reduce the cross-section of beams and columns and lower the foundation load, thereby saving steel bars and concrete. For super high-rise buildings, the weight accumulation effect of the air duct system is significant - PIR air ducts' lightweighting not only reduces the installation difficulty but also optimizes the structural design of the building from the source.

In addition, PIR air ducts adopt an integrated design of air duct insulation, eliminating the need to wrap insulation cotton outside the traditional air ducts, which can save valuable equipment space in the ceiling.

Send inquiry

Indoor Environmental Quality (IEQ) of PIR Pre-Insulated Aluminium ducting

the inner surface of PIR ducts is smooth aluminum foil, without the risk of fiber shedding, and does not accumulate dust or breed microorganisms.

The smooth aluminum foil inner wall also reduces the air resistance within the duct, reduces the energy consumption of the fan, and avoids the leakage problem caused by the non-strictness of the tongue-and-groove connection in traditional iron sheet ducts. The porous structure of PIR foam can effectively absorb vibrations and echoes, eliminating the resonant noise of "clang, clang" that occurs in traditional iron sheet ducts during operation.

For places with strict requirements for air cleanliness, such as hospital operating rooms, ICUs, pharmaceutical workshops, and electronic factories, the smooth inner wall and antibacterial and anti-oxidation coating of PIR ducts provide natural hygiene protection - without the need for additional lining materials, they can meet the air supply quality requirements of clean air conditioning systems.

Send inquiry

Why choose UNTDuct

UNT Pre-insulated Ductwork

UNTDuct System

UNT Duct System

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

Hot Tags: pir pre-insulated aluminium ducting, China, suppliers, manufacturers, factory, customized