The whirlpool factory in Oxford, Mississippi, makes built-in kitchen ovens. In the 1990s, this plant re-engineered its processes to become JIT/lean. One of the parts of a particular oven, Part A, is processed by two 600 ton presses (in series), and then goes through a porcelain system to be coated. Finally, it is stored in the WIP storage location until it is used by the assembly lines. As a container of Part A is to be used, the kanban attached to it is taken to the press area and posted on the Kanban Post. Demand for part A is 175 units per workday. A workday is 19 hours. The container size is 30 units. The setup time is 1 hour. Because of the large setup time, 5 kanbans are accumulated before production of A begins on the presses (approximately 16 hours of wait time). Production rate for A is 120 units per hour. The safety factory is 120 percent. Determine the number of kanbans required for Part A.