Core Definitions
| Term | Full Name | Core Structure | Main Function |
|---|---|---|---|
| Pre Insulated Duct | Prefabricated Insulated Ductwork System | "Sandwich" structure: inner sealing layer (e.g., aluminum foil, aluminum sheet), middle insulation layer (e.g., polyurethane foam, phenolic foam), outer protective layer (e.g., aluminum sheet, galvanized steel sheet) | While distributing conditioned air, it maintains stable air temperature (reducing heat gain and loss) and does not require additional insulation layers. |
| GI Ductwork | Galvanized Iron Ductwork | Rectangular or circular ductwork made by bending and joining flat galvanized iron sheets (steel sheets with a thin zinc coating on the surface for rust prevention) | Only responsible for distributing conditioned air; additional insulation layers (e.g., glass wool, foam boards) are required to reduce heat transfer. |
Pre insulated duct VS gi duct
| Product Description | Pre Insulated Duct | GI duct |
| Weight | Light, 1/6 - 1/10 | More than 6 times heavier than PU/PIR insulation pipe |
| Space Required | Small | Large |
| Insulation Condition | Self - insulating | External glass wool insulation wrapping |
| Thermal Conductivity | 0.020 W/m.K | 0.047 - 0.052 W/m.K |
| Water Absorption Rate | Almost no water absorption (0.1%) | High water absorption rate |
| Gas Leakage Condition | Negligible | Prone to leakage after a period of use due to absorption and expansion |
| Sound Insulation Effect | Sound - insulating | Prone to generate noise |
| Product Service Life | Long | Short (prone to corrosion) |
| Product Installation | Simple and convenient installation | Complex and time - consuming installation |
| Energy - saving Condition | Good thermal conductivity and non - leaky performance enable it to save about 20% of electricity | Power - consuming |
| Appearance | Beautiful | Poor appearance |
| Transportation Cost and Labor Cost | Low | Low |
Comparison of Advantages and Disadvantages: Pre-Insulated Duct VS GI Duct
Pre-insulated duct
Structure: Consists of a foam insulation layer (e.g., PU/PIR) sandwiched between aluminum foils, forming an integrated air flow channel.
Advantages:
Energy Efficiency: Reduces heat loss/heat gain and improves energy efficiency.
Lightweight & Easy Installation: Light in weight, usually equipped with a guide rail system for quick fixation.
Eco-Friendly & Noise Reduction: Features sound insulation performance and meets green building requirements.
Applicable Scenarios: Widely used in modern HVAC systems, especially suitable for occasions with high requirements for thermal insulation performance and installation efficiency.
Galvanized Iron (GI) Ductwork
Structure: Made of galvanized steel sheets, usually assembled on-site, and requires additional external insulation layers.
Advantages:
High Strength & Durability: Excellent mechanical properties, suitable for high-pressure systems.
Flexible Customization: Can be adjusted in shape and size on-site according to needs.
Limitations:
Heavy Weight: Time-consuming to install and requires additional insulation treatment.
Condensation Risk: If the insulation layer is improperly installed, condensation is likely to occur.
The packing and container loading of Pre Insulated Duct
Pre Insulated Duct Sheets:
Regular Size: 3950*1200*20mm/ 2900*1200*20mm
PIR Foam Density: 52kg/m3,
Weight: about 1.4kg/m2
Packing: 10 sheets/ paper carton
Container Loading:
40'HQ Container: 3950/2900*1200*20mm, 10 sheets packed in one carton, total 660sheets (3950mm) / 880sheets(2900mm).
20'GP Container: 2900*1200*20mm, 10 sheets packed in one carton, total 400sheets.
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