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Durable Glass Wool Board for Fire Smoke Exhaust System Thermal Protection. Class A Fire Resistance: Non-combustible material meeting Class A fire standard for safety. Customizable Dimensions: Supports custom length, width, thickness, and density. Corrosion & Moisture Resistant: Acid/alkali resistant, anti-aging, and strong vapor barrier. Sound Absorption: Effective noise reduction and sound insulation properties. Online Technical Support: 24-hour response with guidance and construction plans. Free Sample Testing: Free small samples available; buyer covers freight. Versatile Applications: Ideal for walls, roofs, HVAC, and steel structures.