Thanks to its excellent products and quality services, UNT Duct is one of the leading polyurethane pre-insulated 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.
Polyurethane Pre-insulated Duct board
Manufactured with high-performance PU foam as the core material, Polyurethane Pre-insulated Duct board are lightweight composite products. They integrate excellent thermal insulation, structural rigidity and certified fire resistance into one integrated unit, and are widely used in various HVAC construction projects.
Structure: Silver Aluminum/ PU Foam/ Silver Aluminum
Size: 3950*1200*20mm
Foam Density: 40-45kg/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)
Weight, Construction Efficiency and Project Cost of Polyurethane Pre-insulated Duct board
1. Lightweight Advantage & Ceiling Load Reduction
Polyurethane Pre-insulated Duct Board feature a surface density of 1.4 kg/㎡. In contrast, the composite assembly consisting of 0.75 mm galvanized steel sheet plus 25 mm glass wool insulation weighs roughly 2.3 kg/㎡. Our duct system achieves a 40% weight cut, effectively mitigating static load exerted on building ceiling structures. For renovation projects, extra reinforcement of ceiling joists can be entirely omitted.
2. Dramatically Accelerated On-Site Installation
With factory-modular cutting, gluing and integrated forming techniques, the installation cycle for a full-floor PIR duct system is merely one-fifth of the timeline required for conventional galvanized metal ductwork. As a practical reference: a 20,000 ㎡ office building required 28 working days for traditional duct installation, whereas the equivalent PIR duct layout was fully finished within only 6 days.
3. Optimized Labor Expense & Balanced Total Project Cost
Three labor-intensive procedures-metal sheet bending, on-site insulation wrapping and aluminum foil cladding-are completely eliminated, delivering a 25% reduction in labor expenditure. Though the unit material cost of PIR panels is 10% higher than glass wool composite duct systems, savings on labor and shortened construction schedules offset the raw material premium. The overall comprehensive project cost ends up equivalent, or marginally lower in many cases.
What is the expected lifespan of the duct system?
PU pre-insulated duct system: 20+ years of service life under standard indoor conditions.
Standard lifespan: 20+ years (indoor, commercial/normal industrial, proper installation & maintenance). -
Conservative range: 15–20 years (humid coastal areas, moderate industrial exposure).
Core durability factors
Closed-cell PU foam core: resists moisture, mold, and degradation. -
Double-sided aluminum foil: corrosion-resistant, non-combustible, and aging-resistant.
Fully sealed joints: minimal air leakage, stable thermal performance over time.
Compared with traditional ducts
GI ducts (with insulation): 5–10 years (prone to rust, insulation failure).
Flexible ducts: 10–15 years.
PU pre-insulated ducts: 20+ years.
Maintenance tip Annual visual inspection and cleaning of the outer surface keep it performing well for 20+ years.
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