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Ventilation System Vent 90 Elbow Galvanized Gi Spiral Duct. High Efficiency Airflow: Round shape minimizes resistance for smooth airflow and energy savings. Corrosion Resistant: Galvanized steel construction ensures durability in humid environments. Fire Resistant: Non-combustible material complying with strict fire safety standards. Noise Reduction: Cylindrical design reduces noise levels compared to rectangular ducts. Easy Installation: Lightweight modular design allows quick connections and lower labor costs. Customizable Options: Available in various sizes, insulation types, and coatings for specific needs.