Abstract: An air drying system includes drying devices, each including an intake port and an exhaust port, measuring devices installed on respective exhaust pipes coupled to the exhaust ports of the drying devices, and measuring flow rates of air discharged from the drying devices, valves installed on the exhaust pipes to control the flow rates of air discharged from the drying devices, and a controlling device that receives data from the measuring devices, and controls the valves such that the flow rates of air discharged from the drying devices are uniform. The drying devices are controlled such that air is discharged from the drying devices at a uniform flow rate.