Features: The ventilation kit adopts sleeve fan with two ball bearing, with rating voltages of DC12V and air flows up to 200CFM. By manually controlling the dimmer, the speed canbe adjusted. Equipped with speed controllers, directly connection to the female socket of the fan, select the required speeds level to start. In order to meet the needs of various applications, the kit includes two pipe ends installed in circular pipes, such as growing tents, 3D lasers experiments, 3D cutting ventilation, and 3D painting to exhaust bad air or help with cooling. Very suitable for kitchen, bathroom, electric soldering iron, restaurant, pet house, 3D printer shell and computer settings to ensure heat dissipation. The fan kit is designed with double air ducts, which is suitable for pipes with a diameter of 12cm. It needs tobe simply assembledly with a screwdriver, making it a practical supplement to any ventilation system. Specifications: Component:Plastic Size:Approx. 175x118mm Color:Black Input: AC100-240V 50/60Hz Output: 3V-12V 2A Rotational speed: 6000rpm Air volumes: 200CFM Package Includes: 1 Set Exhaust Fan note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you donot mind befores you order. 2.Due to the differences between different monitors, the picture may not reflect the actual color. Thanks for your understandings.