A. Advantages of UNTDuct PIR Pre-insulated HVAC Ductwork:
B. Advantages over Traditional Air Ducts
| parameter | PIR foam ducts | Galvanized iron duct | Phenolic air ducts |
| thermal conductivity | 0.018-0.022 W/(m ·K) | No insulation | 0.036 W/(m ·K) |
| Fire rating | Grade B1(core)+grade A1(top layer) | Additional fireproof cladding is required | Class B1 (but with high actual smoke density) |
| weight | 1.4-4.5 kg/m² | 15-20 kg/m² | 8-10 kg/m² |
| Installation efficiency | 3-6 times more than traditional air ducts | On-site insulation +fire protection treatment is required | The brittleness is large and the loss rate is high |
| Service life | More than 20 years | 5-8 years(easy to rust) | 3-5 years(easy powdering) |
C.Materials and Structural Parameters
Core material:
Fully water-expanded polyisocyanurate (PIR) foam is adopted, with a closed-cell rate of ≥95%, and the density range is typically 40-50 kg/m³ (up to 55 kg/m³ for some reinforced products).
Surface layer:
Double-sided composite aluminum foil (60-200 microns), color steel plate or galvanized steel plate, with anti-corrosion polyester coating on the surface, UV resistant and anti-corrosion, suitable for indoor and outdoor environments.
Core indicators:
The thermal conductivity of PIR foam is as low as 0.018-0.022 W/(m·K), which is superior to traditional polyurethane (PUR) and phenolic materials. A 20mm thick insulation layer can meet the requirements of GB 50189-2015 "Standard for Energy Efficiency Design of Public Buildings".
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