Image forming device having exhaust channel for exhausting air out of the device

An image forming device comprising:

• a main casing;
• a process unit including an image-bearing member onto which an electrostatic latent image is formed, a developing unit that supplies developing agent to the electrostatic latent image formed on the image-bearing member to form a developing-agent image on the image-bearing member, and a transfer unit that transfers the developing-agent image from the image-bearing member onto a recording medium;
• a fixing unit that thermally fixes the developing-agent image onto the recording medium;
• and
• a duct disposed between the process unit and the fixing unit with respect to a first direction in which the recording medium is conveyed, the duct defining an exhaust channel for exhausting air out of the main casing, wherein
• the duct includes at least two partitioning walls extending in a second direction intersecting with the first direction, and is formed with at least three inlet ports partitioned by the partitioning walls in the first direction.