A fan unit is a device that is used to circulate air in a room or building. It is typically used to improve air circulation and to reduce the temperature of a room or building. Fan units are commonly used in homes, offices, and industrial buildings. They are available in a variety of sizes and designs, ranging from small ceiling fans to large industrial fans. The most common type of fan unit is the centrifugal fan, which uses a rotating impeller to draw air in and push it out. Other types of fan units include axial fans, which use a series of blades to move air, and blower fans, which use a single blade to move air. Fan units are also available in different power levels, from low-powered fans to high-powered fans. Fan units are an essential part of any air conditioning system, as they help to keep the air in a room or building cool and comfortable.