1 Noise Insulation: Efficiently isolates outdoor & equipment noise to cut down sound transmission greatly. 2 Eco-friendly Materials: Constructed with corrosion-resistant metal and harmless sound-absorbing filler. 3 Multi-functional Use: Widely used for factory peripherals, road sides, generator rooms and ventilation openings. 4 One-year Warranty: Delivers dependable after-sales support and full product quality guarantee. 5 Professional Installation: Customized sizes available with on-site mounting for stable and tight installation.