Name: Lightweight PIR Ducting Suppliers and Manufacturers - China Factory - UNT Duct
Brand: UNTDuct
SKU: 312040106

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

Lightweight PIR Ducting

Lightweight PIR Ducting (also known as PIR pre-insulated duct panel) is a high-performance, sandwich-type material specifically engineered for Heating, Ventilation, and Air Conditioning (HVAC) ductwork.

Composition & Structure

As the name suggests, it is a composite material consisting of two distinct layers bonded together:

Core Layer: A rigid foam made of Polyisocyanurate (PIR). This is a thermoset plastic that provides the primary insulation.

Facing Layers: Both sides of the foam core are laminated with aluminum foil. The thickness of the aluminum can vary (standard is 60 or 80 microns, but 200-micron sheets are available for higher durability).

Regular Dimension: 3950*1200*20mm
Packing: 10 sheets/ package
Loading: 660 sheets/ 40'HQ packed with paper carton

710 sheets/ 40'HQ packed with plastic bag

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Extreme Safety of Lightweight PIR Ducting

In the field of fire safety, conventional standards only focus on the speed of flame spread. PI foam offers a more comprehensive solution for "heat un-controlable".

Ultra-low smoke and toxicity: In fires in enclosed spaces (such as subways, hospitals, and submarines), the toxicity of smoke is often the leading cause of death. PI foam emits extremely low smoke during combustion (smoke density < 5), and no toxic gases are released. The lethal gases such as HCN and HCl released by traditional rubber or polyurethane materials during combustion are fundamentally suppressed in PI.

Formation of self-healing barrier layer: Unlike ordinary flame-retardant materials that add halogen-based flame retardants, the PI foam forms a dense carbonized layer at high temperatures due to its aromatic ring structure. This "char barrier" can effectively block oxygen and heat radiation. Even when the heat source temperature reaches 500°C, only a slight carbonization occurs on the material surface without causing structural collapse. This "ablation-resistant" property provides precious time for evacuating personnel.

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certification of Lightweight PIR Ducting

Fire Safety, Thermal Conductivity and Physical Performance

Fire Safety Class 0 (BS 476 Part 6&7)

Fire Safety

ASNZS 1530.3

thermal Conductivity

0.020w/M.k

Compress Strength

202KPA

foamed with CFC HCFC Free agent

Why choose UNTDuct

UNT Pre-insulated Ductwork

What is 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.