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Centrifugal Fiberglass Insulation Roll Glasswool Felt for Duct & Exterior Steel Partition Wall. Class A1 Fireproof: Non-combustible material ensuring maximum safety in HVAC and building applications. Flexible Installation: Lightweight and flexible felt design suitable for ducts, roofs, and steel structures. Professional Technical Support: Online technical assistance, installation guidance, and on-site construction support. CE & ISO Certified: Product and management systems certified for quality and safety assurance.