Thanks to its excellent products and quality services, UNT Duct is one of the leading pir pre-insulated rectangular ductwork 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.

What is PIR Pre-insulated Rectangular Ductwork?

Imagine an HVAC duct system that combines three critical layers into one lightweight panel: a corrosion-resistant metal surface (usually aluminum or coated steel), a high-density Polyisocyanurate (PIR) foam core, a vapor barrier. This is not traditional sheet metal-it's a next-generation, pre-insulated ductwork system.

Structure: Silver Aluminum/ PIR Foam/ Silver Aluminum
Size: 4000*1200*20mm
Foam Density: 50±3kg/m³
Aluminum Thickness: 0.06mm or 0.08mm
Packing: 10 sheets/ package
Loading Capacity: 710 sheets/ 40'HQ (packed with plastic bags)
660 sheets/ 40'HQ (packed with cardboard box)

Why choose PIR Pre-insulated Rectangular Ductwork over traditional sheet metal ducts?

Traditional ducts need separate insulation (fiberglass, rockwool) wrapped around them on-site. This process is slow, labor-intensive, and prone to errors (gaps, moisture, mold). PIR ducts arrive ready to install.

Top 5 Benefits for Your Business

Superior Energy Efficiency (Lowest Thermal Conductivity)

PIR foam has a lambda value as low as 0.022 W/mK-up to 2x better than fiberglass or EPS. This means less thermal loss, colder chilled water, and significantly lower HVAC running costs.

Built-in Fire Safety

PIR is a thermoset material that chars rather than burns. It achieves Class B-s1, d0 (Euroclass) or equivalent low smoke/toxicity ratings. It self-extinguishes and produces minimal smoke-critical for life safety.

Mold & Moisture Proof

Closed-cell PIR core does not absorb water. No wicking, no condensation drips, no hidden mold growth. Ideal for hospitals, food processing, and humid climates.

Lightweight & Easy to Install

Weighs up to 80% less than sheet metal + external insulation. One person can carry a 4m duct section. Cutting is dust-free and tool-safe (hand saws, CNC routers). Installation is up to 50% faster-lower labor costs.

Clean & Quiet

Smooth inner aluminum surface resists dust buildup (better IAQ). The dense foam dampens structure-borne noise and fan vibration-no "oil-canning" or rattling.