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4inch ~12inch Duct Booster Indoor System Mixed Flow Axial Inline Duct Fan. Dual Speed Control: Features a two-speed motor option for flexible airflow management. High Efficiency Motor: Equipped with 100% copper wire motor and double ball bearings. Wide Size Range: Available in 4, 5, 6, 8, 10, 12, and 14-inch models. Low Noise Operation: Designed for quiet performance suitable for indoor environments. Easy Installation: Convenient buckle design with durable stainless steel clamp. OEM Service Welcome: Customization services available for branding and specifications. Versatile Application: Ideal for offices, hotels, homes, gyms, and kitchen ventilation. Sample Acceptance: One sample order is accepted for quality verification.