Image forming apparatus to selectively supply air to stations including image forming units

An image forming apparatus comprising:

• a plurality of image forming units;
• a plurality of stations to and from which the plurality of image forming units are attachable and detachable;
• a plurality of air supply ports through which air is supplied to the plurality of stations;
• an air supply duct to cause air taken from an outside of a body of the image forming apparatus to flow toward the plurality of air supply ports;
• a plurality of exhaust ports through which air is exhausted from the plurality of stations;
• and
• an exhaust duct to cause air exhausted from the plurality of exhaust ports to flow toward the outside of the body of the image forming apparatus,
• wherein, when image formation is performed in a full specification state in which all of the plurality of image forming units are installed in the plurality of stations, air is supplied from all of the plurality of air supply ports to all of the plurality of stations, and
• wherein, when image formation is performed in a specified specification state in which a station to be used in which one of the plurality of image forming units is installed and an unused station in which none of the plurality of image forming units is installed are present among the plurality of stations, air is supplied to the station to be used from an air supply port corresponding to the station to be used among the plurality of air supply ports, air is not supplied to the unused station via another air supply port among the plurality of air supply ports, and air is not exhausted from the unused station via said another air supply port.