This product is called Fire Fighting Lithium Battery Smoke Exhaust Ventilator. The fan tilt anglenis adjustable, suitable for different occasions.This product has a lot of advantages: low energy consumption, strong power and stable performance, equipped with a large-capacity lithium battery as a power that it can be pushed at the touch of button boot up to meet mobile needs and a variety of power supply methods. And it can be used in many places. Such as workshop, office, restaurant, kitchen and so on.