A base structure of the system with a pair of center containers each of rectangular form with a square width and height and an elongated length attached along an elongated side of each. A side container may be attached to each side of the center containers. A semicircular shaped inlet port is formed in a top wall of each of the center containers to form a circular inlet port. A vertical duct of cylindrical form may be attached over the inlet port and have a lower portion of constant diameter cross-section and an upper portion diverging outwardly. A fan placed in each center container to cause an air flow toward a center of each center container to be channeled upwardly to exit through the inlet port for air to flow through the vertical duct to exit the open top end. A recirculating air structure may be formed with additional containers.