Powerful Ventilation: This inline exhaust fan with 3300 RPM can generate 405 CFM airflow, effectively circulating air, quickly move vast amount of air to exhaust odors. Sturdy and durable: Made of high-quality carbon structural steel, not easy to deform, well-made and durable. Reduced maintenance in demanding applications, even in harsh environments. Fan bearings are NSK/SKF bearings, the best quality in the world. . Low Noise Level: Durable plastic fan blades rotate smoothly,EC motor provides quiet and energy-efficient performance with minimal heat and noise.High static pressure, low energy consumption. Adjustable Speed: A stepless speed controller on the power cord enables the fan to run at different speeds; With this speed switch, you can adjust it to the desired. airflow level. Widely Used: The inline fan is perfect for greenhouse, planting tent, kitchen, bathroom,,restaurant, etc., to ventilate the indoor air and ensure air circulation,Effectively eliminate odors. The 4" inline duct fan with 350-3300 RPM can generate 405 CFM airflow,effectively circulating air.