Bathroom Inline exhaust fans ceiling/ventilation grilles for door/ceiling

1).The shell is made of polypropylene plastic, one-time disposable molded, with high anti-acid function. 2) . Using ABS blades, design by hydromechanics to reach the optimal air and pressure. 3) .Two-speed motor, imported NMB ball bearing, it's life expectancy up to 50,000 hours. 4) .IP44 Protection class, waterproof and dustproof more effective. 5) .Can be designed with a delay function, temperature sensors and humidity sensors, more of user-friendly features design. 6) .Run the ambient temperature range: -20°C~60°C.