Patent ID: 8488989

Claim:
An image forming device comprising: a main casing; a process unit including an image-bearing member onto which an electrostatic latent image is configured to be formed, a developing unit configured to supply 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 configured to transfer the developing-agent image from the image-bearing member onto a recording medium; a fixing unit configured to thermally fix the developing-agent image onto the recording medium; 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; a fan disposed on one side of the duct in the second direction and configured to exhaust air out of the main casing; and a filter disposed within the duct, 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; the filter is disposed along the entire length of the exhaust channel in the first direction over the partitioning walls at a position biased toward the one side of the duct; the process unit includes a discharging unit configured to generate a discharge for charging the image-bearing member; the at least two partitioning walls include a first partitioning wall nearest the process unit and a second partitioning wall nearest the fixing unit; the duct includes a first side wall and a second side wall located closer to the fixing unit than the first side wall; the at least three inlet ports include a first inlet port located between the first partitioning wall and the first side wall with respect to the first direction, a second inlet port located between the second partitioning wall and the second side wall with respect to the first direction, and a third inlet port located between the first inlet port and the second inlet port with respect to the first direction; the duct further includes a channel wall disposed in the exhaust channel; the channel wall partially defines a first path through which air drawn in the exhaust channel through the first inlet port and the third inlet port flows to the fan and a second path through which air drawn in the exhaust channel through the second inlet port flows to the fan; and the first path is longer than the second path.