A Magnesium Oxide (MgO) duct board is a factory-prefabricated, non-combustible structural panel engineered specifically for central air conditioning supply ducts, commercial ventilation, and passive fire/smoke extraction systems. Manufactured from magnesium sulfate/oxide chemistry, MgO duct board combines structural rigidity, inherent thermal protection, and Class A1 fire resistance in a thin 6mm to 10mm profile, eliminating the labor-intensive external insulation required by traditional galvanized sheet metal.
Technical Comparison: MgO Board vs. Fiber Cement Board vs. Galvanized Steel in HVAC Duct Systems
| Feature / Metric | MgO Duct Board | Fiber Cement Board | Galvanized Sheet Metal |
| Primary HVAC Application | Central Supply & Smoke Exhaust | General Wall Cladding / Sheathing | Traditional Ductwork |
| Fire Performance Rating | Class A1 / ASTM E119 Non-combustible | Class A1 Non-combustible | Non-combustible (Heat Conductive) |
| Thermal Insulation | Inherent Thermal Resistance | Low Insulation Value | None (Requires External Insulation) |
| Thickness Range for Ducts | 6mm – 10mm (High Strength) | 8mm – 12mm+ (Heavy) | 0.8mm – 1.2mm |
| Flexural & Tensile Toughness | High Toughness / Crack-Resistant | Brittle / Prone to Edge Micro-cracks | High Ductility |
| Joinery & Edge Milling | Precision Tenon, Groove & T&G | Poor Milling / Crumbles under Stress | Sheet Metal Locks / Flanges |
| System Weight & Load | Lightweight / Low Hanging Load | Heavy Hanging Load | Medium-to-Heavy |
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