Cooling fans and air circulators move air to cool workers and equipment, dry surfaces, and exchange stale air with fresh air. Air circulators and air cannons move high volumes of air in large or open spaces. Axial fans and accessories cool and support cooling of internal electrical components such as computers, vending machines, copy machines, and machine tools. Ceiling fans are ceiling mounted to circulate air vertically, either pulling air from the floor to the ceiling, or moving air from the ceiling to the floor. DC fans use a DC power source, such as those found in vehicles and on agricultural equipment. Residential and office fans cool smaller spaces than air circulators and cannons, including offices, garages, and patios. Transformer cooling fans mount to an electrical transformer to cool transformer radiators.