1.Large Airflow ventilation --Large air volume ventilation: The exhaust volume of this louver ventilation fan is 460CFM, and the air intake volume is 380CFM. The thickened blades are more stable and the ventilation speed is faster. 2.Large Airflow ventilation --Large air volume ventilation: The exhaust volume of this louver ventilation fan is 460CFM, and the air intake volume is 380CFM. The thickened blades are more stable and the ventilation speed is faster. 3.Can Exhaust In Reverse -- This exhaust fan is a 2-way linkage type ventilation fan.In addition to exhausting smoke, it can eliminate sweltering hot air masses, and inhale cool nature wind to achieve ventilation. 4.Stable & Exhaust Fan -- High-quality wear-resistant sleeve bearing motor, which can continually work for 9,000 hours, quiet and stable. The shell and fan are made of high-quality ABS material, which is sturdy and durable. 5.Easy To Install -- Applied to vents, kitchen, bathroom, shopping mall, bedroom, living room. It comes with 55 inch power cord with plug.The detachable design is convenient for cleaning up fragment or greasy dirt regularly for increasing life. 6.Overheat Protection Easy Operation - with overheat protector, efficient temperature fuse, r to use.The first pull, the fan runs and exhausts outward. The second pull, the fan reversely runs, and the air is inward. The third pull, the ventilation fan stops running and the louver will close.