What is the definition of a powered louvered vents? Also known as exhaust fans, powered louvered vents are a type of mechanical ventilation system designed to draw out stale, polluted air from a home or building and replace it with fresh, filtered air. Powered louvered vents rely on a fan or a motor to move the air, as opposed to natural ventilation, which uses a passive system like windows and doors. Powered louvered vents can be found in many places, such as bathrooms, kitchens, attics, and basements. They are usually installed on the ceiling, wall, or floor and can be found in a variety of sizes and styles. Some of the most common powered louvered vents are the centrifugal type, which is designed to move air in a circular motion, and the axial type, which moves air in an up-and-down pattern. They come in various designs, including round, rectangular, and square, and can be used to control the temperature and humidity