A fan ventilator is a device that is used to draw air into, or expel air from, an enclosed space. It is commonly used in industrial, commercial, and residential settings to provide ventilation, circulate air, and to maintain a comfortable environment. Fan ventilators come in a variety of sizes and shapes, and can be powered by electricity, gas, or solar energy. The most common type of fan ventilator is the centrifugal fan, which is used to move air through a duct system. This type of fan uses blades to draw air in and then expel it out at a higher velocity. Other types of fan ventilators include axial fans, which move air in a straight line, and mixed-flow fans, which combine both axial and centrifugal forces. Fan ventilators are an important part of any ventilation system, as they help to maintain a healthy and comfortable environment. They are also used to reduce energy costs by helping to regulate temperatures in buildings and homes.