Name: PIR Insulation Air Duct Board Suppliers and Manufacturers - China Factory - UNT Duct
Brand: UNTDuct
SKU: 312982579

Thanks to its excellent products and quality services, UNT Duct is one of the leading pir insulation air duct board 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 Insulation Air Duct Board

PIR Insulation Air Duct Board is essential high-performance elements for modern HVAC systems. Built with an aluminum foil–PIR foam sandwich, they replace traditional galvanized steel ducts with on-site insulation. Suitable for hotels, offices, airports, hospitals, and other commercial and public buildings.

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)

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Fire protection, durability and operation and maintenance costs of PIR Insulation Air Duct Board

Fire Safety

PIR foam core: Class B1 flame retardant; aluminium foil surface: A1 non-combustible. Low smoke output and no dripping while burning. Complies with BS 476 and EN 13501, ideal for high fire-risk sites: data centres, subways and hospitals.

Long Service Life

Strong corrosion resistance. 95% strength retained after 720 hours acid/alkali immersion; no rust or pulverisation. Designed service life: 20 years. Galvanized steel ducts rust easily (5–8 years lifespan); phenolic ducts crack within 3–5 years.

Lower O&M Costs

Built-in moisture and corrosion resistance; no yearly rust removal and repainting required. Annual maintenance cost equals only 30% of traditional ducts. Low air leakage lessens load on main units, cutting fan loss and maintenance frequency. Total life-cycle costs are reduced by 30%–40%.

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Thermal Insulation and Physical Performance of PIR Insulation Air Duct Board

The industry-leading insulation capacity directly reduces HVAC energy consumption by approximately 25%.
Thermal conductivity λ = 0.022–0.024 W/m·K (at 10°C, EN 12667), superior to rock wool (0.040) and ordinary PU (0.026).
Thermal resistance R: 20 mm = 0.85, 30 mm = 1.25, 50 mm = 2.25 m²·K/W.
Example: 50 mm thick PIR-ALU duct, annual energy savings of approximately 22 kWh/㎡, 10,000㎡ project saves approximately 18,000 yuan in electricity annually.

Compressive strength: ≥ 150 kPa (10% deformation, EN 826), 20 mm thick can withstand ±500 Pa air pressure, meeting the requirements of medium and high pressure ducts.
Weight: approximately 1.2–1.5 kg/㎡ (20 mm), only 1/5 of traditional iron sheet ducts, reducing ceiling load and installation labor time by 30%+.
Size stability: deformation ≤ 3% at 70°C/90% humidity, no deformation or cracking during long-term use.

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Why choose UNTDuct

UNTDuct focuses on pre-insulated duct systems and HVAC applications. We manufacture PIR duct boards for commercial, industrial and building services projects and support customers with product specifications based on project requirements.

In addition to PIR duct panels, UNT Duct supplies fabrication tools, jointing accessories and reinforcement components used in pre-insulated duct fabrication. Packaging and loading can also be arranged according to panel dimensions, order quantities and export transportation requirements.

UNT Ductwork

FAQ Of PIR Ducting

FAQ of PIR Ducting

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
Compressing 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.