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Reliable Glass Wool Board for Smoke Exhaust System Heat Resistant Easy Install. Class A Fire Resistance: Non-combustible material meeting Class A fire standard for safety. Customizable Dimensions: Supports custom length, width, thickness, and density for projects. Moisture & Corrosion Resistant: Acid/alkali resistant, anti-aging, and strong vapor barrier. Online Technical Support: 24-hour response with guidance, plans, and parameter matching. Free Sample Testing: Free small samples available; buyers cover express freight. Versatile Application: Ideal for walls, roofs, HVAC, and steel structures. ISO & CE Certified: Products certified ISO, CE, ASTM for quality assurance.