Patent ID: 7467522

Claim:
A refrigerator unit for container, comprising: a ventilation unit configured to ventilate air from an interior of a container, the ventilation unit having a ventilation passage through which ventilated air passes and an opening/closing member configured to open and close the ventilation passage; an acquisition unit configured to acquire ventilation data related to a quantity of air ventilated by the ventilation unit and configured to acquire opening degree data indicating the degree to which the opening/closing member has opened the ventilation passage as at least part of the ventilation data; a recording unit configured to record the ventilation data acquired by the acquisition unit; and a first output unit configured to output the quantity of the air ventilated by the ventilation unit based on the ventilation data recorded by the recording unit, the acquisition unit having an opening degree detecting device and a transmitting device, the opening degree detecting device being configured to detect the opening degree based on a movement amount of the opening/closing member and the transmitting device being configured to transmit the movement amount of the opening/closing member to the opening degree detecting device.