PIR Pre-insulated Ducting

Thanks to its excellent products and quality services, UNT Duct is one of the leading pir pre-insulated ducting 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 pre-insulated ducting is a high-performance system used in Heating, Ventilation, and Air Conditioning (HVAC) to distribute air efficiently. Its core is a rigid foam insulation made of Polyisocyanurate (PIR), which is sandwiched between protective facings, typically aluminum foil or steel. This "all-in-one" design is a key differentiator from traditional systems.

 

Structure: Silver Aluminum/ PIR Foam/ Silver Aluminum
Size: 3950*1200*20mm
Foam Density: 53kg/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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PIR ducting is considered a technological upgrade over conventional materials like glass wool or galvanized steel, offering several key benefits.

Superior Thermal Insulation:

PIR foam has a very low thermal conductivity, about 0.022W/m·K. This is roughly half that of glass wool, meaning it provides nearly double the insulation performance for the same thickness. This translates directly to significant energy savings and lower cooling/heating loss.

Enhanced Fire Safety:

The foam is formulated to achieve a B1 fire rating (according to GB 8624-2006 standard). Importantly, high-quality PIR does not release toxic black smoke when exposed to fire, which is a critical safety factor for building evacuation.

Built-in Moisture Resistance:

Unlike glass wool, which has an open-fiber structure that can absorb water, PIR has a closed-cell structure. Its water absorption rate is exceptionally low (≤0.1% to 0.36%), which prevents mold growth, maintains long-term insulation performance, and protects the duct from corrosion.

Fast and Simple Installation:

The system is an integrated panel (duct + insulation + vapor barrier). This eliminates the separate, time-consuming steps of wrapping insulation and sealing it. It is also 35-50% lighter than traditional systems, making it faster to handle and install, often reducing installation time by two to three times.

Hygienic and Durable:

The smooth surfaces (often aluminum) are fiber-free, easy to clean, and inhibit microbial growth. This helps maintain high indoor air quality, making it suitable for hospitals, labs, and food factories. The system is also durable, with a stable service life estimated at 20 years or more.

Excellent Air-Tightness:

The panels are fabricated with features like V-grooves and interlocking joints, resulting in a much tighter system with up to 40% lower air leakage than traditional field-assembled ducts, further boosting energy efficiency.

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The UNTDuct PIR System: Redefining Air Distribution Excellence

PIR pre-insulated ducting system is more than just the duct panels themselves; it's a complete, engineered solution. The system can be broken down into four main parts, with the duct panel being the central component .

01

PIR pre-insulated Panels:

This is the fundamental building block, a sandwich structure with three layers.

Inner Layer: Typically a smooth, food-grade aluminum foil that provides a clean, airtight surface. This reduces air friction for efficient airflow and is safe for air handling.

Core Layer: The high-density Polyisocyanurate (PIR) foam provides the primary insulation and structural strength. It has excellent thermal properties (e.g., a thermal conductivity as low as 0.022 W/m·K) and a high fire resistance rating (like Class 0 or B1).

Outer Layer: A protective facing (often aluminum foil or a thicker metal sheet) that shields the core from physical damage, moisture, and corrosion . For outdoor applications, a thicker aluminum sheet or pre-painted galvanized steel is often used for enhanced durability.

02

pre-insulated Duct Accessories:

To connect the panels into a complete duct network, a variety of accessories are needed.

Joining Profiles & Flanges: These components are used to connect the edges of duct panels together securely.

Reinforcement Sections: Aluminum or galvanized steel sections that provide extra structural support, especially for larger ducts to prevent bowing or sagging.

Tapes & Sealants: Specialized adhesive tapes and silicone sealants are critical for sealing all joints and seams. This ensures the system is airtight, preventing air leakage and maintaining energy efficiency.

03

Tools for pre-insulated Duct Fabrication

Fabricating the duct panels into the desired shape requires specific tools, which can range from manual to automated.

Cutting Tools: Manual cutters or advanced CNC Router Machines are used to accurately cut and score the panels.

Bending Machines: Manual or state-of-the-art bending machines help fold the scored panels precisely to form rectangular duct sections. 

04

pre-insulated Duct Know-how

A complete system also includes the technical knowledge for proper design, fabrication, and installation. This expertise ensures the system's performance (airtightness, thermal efficiency, structural integrity) is fully realized.

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Thermal insulation and low smoke, low toxicity:

When it comes to fire safety, PIR foam features intrinsic flame-retardant characteristics. Its Limiting Oxygen Index (LOI) generally exceeds 34%, greatly outperforming the criteria for most conventional flame-resistant materials.

Outstanding Acoustic & Thermal Insulation

PIR foam adopts an open-cell structure with an open-cell ratio reaching up to 99%. This delivers remarkable sound absorption performance, achieving a Noise Reduction Coefficient (NRC) of up to 0.54 across the 125–4000 Hz frequency band. It effectively mitigates airflow noise and equipment operational noise within HVAC systems. Moreover, its thermal conductivity stands below 0.022 W/(m·K), offering dependable thermal insulation while maintaining low weight.

Ultra-Low Outgassing and Superior Chemical Stability

Under vacuum conditions, volatile emissions from materials pose contamination risks to precision instruments. Benefiting from ultra-low outgassing performance, PI foam is extensively applied in aerospace and semiconductor cleanroom settings. Furthermore, it resists corrosion from weak acids, weak alkalis and common oils including 93# gasoline, showcasing robust chemical stability.

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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.

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