Usage Tips:Window fan with reversible function-This square fan is a two-way linkage window exhaust fan, window fans with exhaust and intake can promote air circulation,remove muddy air and keep indoor air fresh.Wall Fan with Large Airflow-Exhaust 200m/h, air intake 180m/h. You can mount it on your wall as a whole-house fan that can help remove moisture, tobacco smoke, and cooking odors to keep your home smelling great.Durable and Safe-The fan adopts permanent lubrication wear-resistant sleeve bearing motor, and anti-rust copper material, built-in overheating protection device, has the advantages of anti-corrosion, long service life , stable speed, safety and low noise. Shell made of ABS material, eco-friendly, lightweight and durable, beauty of modern design, good decoration choice.Perfect for greenhouse ventilation- Temperature and humidity control is the key the success of the greenhouse. This ventilation fan can help air flow in and out, so that the greenhouse can maintain proper humidity and temperature and give plants a healthy growth environment.Multiple Applications-This exhaust fan pull switch is suitable for attic, bathroom, kitchen, window, basement, garage, office, living room and other places that need ventilation, and it is easy to install on the wall or window. Tip: The product comes with a 59 inch power cord without plug