An image forming apparatus, comprising: an apparatus main body; an image forming station (92, 93, 94) arranged in the apparatus main body to perform an image forming process to form an image on a recording sheet; a fixing unit arranged in the apparatus main body to perform a fixing process to fix the image to the recording sheet by heat; a first conveyance path for conveying the recording sheet via the image forming station (92, 93, 94) and the fixing unit; a second conveyance path for conveying the recording sheet having the fixing process performed thereon to an upstream side of the image forming station in the case of performing the image forming process on both sides of the recording sheet; a first cover openably and closably attached to the apparatus main body; and a second cover for covering the second conveyance path charactrized in that the second cover is openably and closably attached to the apparatus main body and openable and closable when the first cover is in an open state and includes a fan for supplying an air stream to the second conveyance path; the apparatus main body is a substantially rectangular parallelepipedic housing and includes a fixed part and a movable part horizontally movable relative to the fixed part, a part of the first conveyance path and the second conveyance path are provided in the movable part and the first cover and the second cover are attached to the movable part, a recess capable of housing the first cover is formed in the outer surface of the movable part, a reversing unit is mounted on a back side of the movable part, the reversing unit including a first surface defining a part of the first conveyance path and a second surface, opposite to the first surface, defining a part of the second conveyance path, the first cover includes a vent (304, 305) at a position facing the fan and is a manual feed tray on which a recording sheet to be conveyed to the first conveyance path is to be placed and which is openably and closably attached to the housing, and one surface of the second cover forms a part of a bottom part of the recess, and the other surface of the second cover faces the second surface. an apparatus main body; an image forming station (92, 93, 94) arranged in the apparatus main body to perform an image forming process to form an image on a recording sheet; a fixing unit arranged in the apparatus main body to perform a fixing process to fix the image to the recording sheet by heat; a first conveyance path for conveying the recording sheet via the image forming station (92, 93, 94) and the fixing unit; a second conveyance path for conveying the recording sheet having the fixing process performed thereon to an upstream side of the image forming station in the case of performing the image forming process on both sides of the recording sheet; a first cover openably and closably attached to the apparatus main body; and a second cover for covering the second conveyance path charactrized in that the second cover is openably and closably attached to the apparatus main body and openable and closable when the first cover is in an open state and includes a fan for supplying an air stream to the second conveyance path; the apparatus main body is a substantially rectangular parallelepipedic housing and includes a fixed part and a movable part horizontally movable relative to the fixed part, a part of the first conveyance path and the second conveyance path are provided in the movable part and the first cover and the second cover are attached to the movable part, a recess capable of housing the first cover is formed in the outer surface of the movable part, a reversing unit is mounted on a back side of the movable part, the reversing unit including a first surface defining a part of the first conveyance path and a second surface, opposite to the first surface, defining a part of the second conveyance path, the first cover includes a vent (304, 305) at a position facing the fan and is a manual feed tray on which a recording sheet to be conveyed to the first conveyance path is to be placed and which is openably and closably attached to the housing, and