A room having dimension 12m × 10m × 3.5m is required to be mechanically ventilated by airconditioner. The temperature difference outdoor ambient air and the supply air is 12°C. Consider three air exchanges per hour. The volumetric specific heat of the air is 1250 J/m³ °C. Assume one ton of refrigeration (TR) is equal to 3.5kW. The capacity of the air-conditioner for the room in TR will be _______.