A centrifugal plenum fan is a type of fan that is used to create air movement within a space. It is designed to move air from one point to another, usually from a central point to the outer edges of a room. The fan works by drawing in air from the center of the room and then pushing it outwards in a circular motion. This creates a pressure differential between the center and the outer edges of the room, which helps to evenly distribute the air. The fan is typically mounted on the ceiling or wall and is powered by an electric motor. The fan blades are designed to spin at high speeds, creating a strong air flow that can be used to ventilate a space or to cool it down. Centrifugal plenum fans are an efficient and cost-effective way to circulate air in a space, making them a popular choice for both residential and commercial applications.