Duct unit and image forming apparatus

A duct unit configured to be disposed inside a housing of an image forming apparatus, the duct unit comprising:

• an airflow generation unit configured to generate an airflow;
• a duct through which the airflow generated by the airflow generation unit flows;
• and
• a first holding portion and a second holding portion for holding the duct unit in the housing,
• wherein the duct has a shape in which an intake port and an exhaust port are located on the same straight line with respect to an airflow direction in which the airflow flows, and a center of the intake port and a center of the exhaust port, in a cross section orthogonal to the airflow direction, are shifted from each other,
• the first holding portion and the second holding portion are provided at different positions with respect to the duct so as to be able to hold the duct unit with respect to the housing in a first posture and a second posture, in which in the second posture a direction in which the center of the intake port and the center of the exhaust port are shifted with respect to the housing is a direction different from a direction in which the center of the intake port and the center of the exhaust port are shifted with respect to the housing in the first posture, and
• an inner peripheral surface of a part of the duct in the airflow direction includes:
• a first surface and a second surface that are arranged in parallel with a first direction along the airflow direction and are continuously arranged so as to intersect each other;
• a third surface that is continuous with the first surface such that the third surface intersects the first surface at an end opposite to an end where the second surface and the first surface are continuous, and arranged along a second direction inclined with respect to the first direction;
• and
• a fourth surface that connects an end of the second surface opposite to an end where the first surface and the second surface are continuous and an end of the third surface opposite to an end where the first surface and the third surface are continuous, and is disposed along a third direction inclined with respect to the first direction.