4 Inch Low Noise Inline Duct Hydroponic Air Blower Fan Exhaust Fan For Home Bathroom Ventilation Grow Room ,Energy-Efficient

- The shell is made of polypropylene plastic, one-time disposable molded, with high anti-acid function. - Using ABS blades, design by hydromechanics to reach the optimal air and pressure. - Good quality imported ball bearings, motor with overload protector, more flexible use, longer life. - High performance, low energy consumption and low noise. - The thickened mounting bracket is more sturdy and practical, and the screws are fixed, which is quick and convenient to install.