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PIR Pre-insulated Air Duct

PIR Pre-insulated Air Duct Systems are prefabricated sandwich panels consisting of a rigid Polyisocyanurate (PIR) foam core bonded to metallic facings-typically aluminum or occasionally steel. This integrated design serves as the air conveyor, thermal insulator, and vapor barrier all in one.

Structure: Silver Aluminum/ PIR Foam/ Silver Aluminum
Size: 3950*1200*20mm
Foam Density: 52kg/m3
Aluminum Thickness: 0.08mm or 0.06mm
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)

Technical Specifications of PIR Pre-insulated Air Duct

Feature	Typical Specification / Range	Notes / Examples
Core Material	Polyisocyanurate (PIR) foam	Closed-cell structure, CFC/HCFC-free
Facing Material	Aluminum foil/sheet (embossed or smooth); Galvanized Iron (GI) sheet available	Steel-faced options for extra durability
Panel Thickness	10mm - 40mm (Common: 20mm, 25mm, 30mm)
Standard Panel Size	Typically 3950 x 1200 mm	Variations: 2950 x 1200 mm, 2900 x 1200 mm
Foam Density	52 kg/m³
Thermal Conductivity	0.022W/m·K	Excellent insulation performance
Operating Temperature	-60°C to +90°C (Typical)	Some products rated from -170°C to +140°C
Fire Rating	Class 0 / B1 (difficult to burn)	Compliant with standards like BS 476 Part 6&7, GB 8624
Max. Air Velocity	Up to 15 - 20 m/s	Depends on panel thickness and facing
Aluminum Foil Thickness	80 microns (inner) / 80-200 microns (outer)	Thicker outer foil for outdoor/exposed applications

Key Advantages of PIR Pre-insulated Air Duct Over Traditional G.I. Ductwork

PIR duct systems offer several compelling benefits that make them a popular choice in modern HVAC design.

Superior Energy Efficiency:

The low thermal conductivity of PIR foam (as low as 0.020 W/m·K ) minimizes heat gain or loss, significantly reducing energy consumption and operational costs.

Lightweight & Easy Installation:

Weighing as little as 1/5 of traditional steel ducts , they are easier to transport, cut, and fabricate on-site. This leads to faster installation, lower labor costs, and reduced structural load.

Excellent Fire Performance:

PIR is a thermoset material with a high charring rate. It is designed to be fire-resistant, achieving Class 0 or B1 ratings , and importantly, it is fibre-free and does not release significant toxic fumes or black smoke during combustion.

Enhanced Indoor Air Quality:

The smooth, non-porous aluminum inner surface prevents the growth of bacteria and fungi, ensuring clean air transport . Some products even feature an integrated antibacterial coating.

Durability and Corrosion Resistance:

The aluminum facings are inherently resistant to corrosion, preventing rust . Protective epoxy or polyester lacquers can further enhance this resistance for harsh environments.