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Ultra-Effective Fiberglass Acoustic Duct for Superior Noise Control. Class A1 Fire Safety: Non-combustible material with Class A1 fire performance rating for maximum safety. Eco-Friendly Material: Formaldehyde-free composite fiberglass, safe for commercial buildings and residential use. Flexible Customization: Customizable thickness (25-30mm), density, and facing types to meet specific project needs. Durable & Stable: Rebound coefficient >0.44 ensures dimensional stability and long-lasting performance.