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Efficient Energy-Saving Rock Wool Board for HVAC Ductwork with Custom Thickness Options. Custom Dimensions: Flexible customization for length, width, and thickness to meet specific project needs. Moisture Resistant: Hydrophobic with >99% water repellency, preventing mold and ensuring durability. Excellent Acoustics: High sound absorption with NRC up to 0.95 for superior acoustic insulation. Eco-Friendly Material: Made from natural basalt rock and recycled slag, contributing to sustainable building.