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Pre-insulated PIR HVAC Ductwork

Pre-insulated PIR (Polyisocyanurate) ductwork is a modern type of composite duct system. It is increasingly popular in contemporary HVAC systems due to its excellent thermal insulation, fire safety, and ease of installation, often seen as a superior alternative to traditional galvanized steel sheet metal ducts.

It is composed of two high-strength facings (such as aluminum foil or color-coated steel sheets) bonded to a rigid PIR foam core. This construction combines insulation and structural functions into a single unit, hence the term "pre-insulated."

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)

Core Advantages of Pre-insulated PIR HVAC Ductwork

Compared to the traditional method of "galvanized steel ducts + on-site insulation wrapping," pre-insulated PIR duct systems offer significant benefits:

Excellent Energy Efficiency:

PIR foam is a rigid foam with a closed-cell structure (over 95%), giving it a very low thermal conductivity, typically between 0.020 - 0.023 W/m·K. This exceptional insulation performance significantly reduces energy loss from cooled or heated air during transport, leading to lower building operating costs.

High Fire Safety:

PIR material inherently possesses excellent fire retardant properties. When exposed to fire, it forms a dense char layer on its surface, effectively preventing flame spread and smoke penetration. Depending on the specific formulation and facings, PIR ducts can achieve high fire safety ratings, such as Class 0 under BS 476 or Class B1 (Difficult Flammability) under the Chinese GB 8624 standard.

Lightweight & Space-Saving:

PIR ducts are typically only about 1/6 to 1/7 the weight of traditional galvanized steel ducts. This significantly reduces the load on the building structure and makes transportation and on-site handling much easier. Furthermore, because the insulation is integrated, there's no need for the extra space required for wrapping insulation around traditional ducts. This can effectively reduce the required ceiling height and save valuable floor space in a building.

Good Airtightness & Condensation Prevention:

Joints in a PIR duct system are typically sealed with specialized aluminum foil tape. Combined with precise fabrication techniques, this creates a system with excellent airtightness. This prevents energy loss from air leakage and effectively blocks moisture ingress. Coupled with PIR's low thermal conductivity, the duct surface is resistant to condensation, avoiding issues like bacterial growth and damage to ceilings caused by moisture.

Integrated Installation, Shorter Project Time:

PIR ductwork utilizes a "single-fix" installation method. Duct fabrication and insulation are completed in one step, either in the factory or on-site. This eliminates the time-consuming secondary process of wrapping insulation around traditional ducts. This significantly speeds up construction, which is a major advantage for projects with tight deadlines.

Environmentally Friendly & Durable:

High-quality PIR products are manufactured without using ozone-depleting blowing agents like CFCs and HCFCs, making them an environmentally responsible choice. The facings (especially color-coated steel) are robust, corrosion-resistant, and durable, contributing to a system lifespan that can exceed 20 years.

In summary, pre-insulated PIR HVAC ductwork is a modern duct solution that integrates thermal insulation, fire safety, light weight, and ease of installation. It not only contributes to building energy efficiency and reduced carbon emissions through its excellent insulation properties but also simplifies the construction process and optimizes space utilization. It represents an ideal choice for modern green buildings and high-performance air conditioning systems.

Performance & Technical Parameters

Specific parameters for PIR ducts can vary between manufacturers and product lines, but core indicators typically fall within a standard range. The table below summarizes some typical technical specifications:

Performance Indicator	Typical Range/Value	Notes / Source
Thermal Conductivity	0.022 W/m·K	Key indicator of insulation performance; lower is better.
Fire Rating	Class 0 (BS 476) or Class B1 (GB 8624)	Meets high fire safety requirements of major international and Chinese building codes.
Core Density	53 kg/m³	Often around 50 kg/m³, ensuring structural strength and stability.
Compressive Strength	≥ 200 KPa (approx. 0.2 MPa)	Indicates the板材's ability to withstand external forces.
Service Temperature	-50°C to +80°C	Suitable for the operating temperature range of most HVAC systems.
Water Absorption	< 0.5%	Extremely low absorption ensures long-term stability of thermal performance.
Standard Dimensions	Width: 1200mm × Length: 3950mm	Common lengths also include 3950mm, 3000mm; thickness typically ranges from 10mm to 40mm.
Facing Materials	Aluminum Foil (e.g., 80μm), Color-coated Steel (e.g., 0.18mm)	Aluminum foil for internal or general use; color-coated steel provides higher mechanical strength for outdoor or high-risk areas.