An image forming apparatus includes an ejection port, a stacker, a fan, and a duct. From the ejection port, a sheet is ejected to an ejection space in an ejection direction. The stacker stacks the sheet ejected from the ejection port, and the ejection space is disposed above the stacker. The fan is disposed outside the ejection space to suck air. The duct is connected to the fan. The duct has an exhaust port and a guide. The exhaust port is disposed above the ejection port and downstream from the ejection port in the ejection direction to exhaust the air from the exhaust port toward an upper face of the sheet in the ejection space. The guide connects the fan and the exhaust port to guide the air from the fan to the exhaust port.

A sheet turning apparatus includes first and second sheet conveyors configured to convey a sheet along respective sheet paths. The sheet is conveyed by the first sheet conveyor in a first disposition relative to an orientation of the first sheet conveyor. Also included is a chamber configured to receive the sheet from the first sheet conveyor. The chamber has an orientation different than the orientation of the first sheet conveyor or an orientation of the second sheet conveyor. The sheet is discharged from the chamber to the second sheet conveyor in a second disposition relative to the orientation of the second sheet conveyor. The second disposition is reversed from the first disposition. Also provided is a method for turning a sheet.

An image forming system includes an image forming apparatus, a pressure-bonding processing apparatus, an inputting portion, and a display portion. The displaying portion displays a pressure-bonding printed matter prepared by changing directions of a front surface and a back surface of the recording material in a case that the directions of the front surface and the back surface of the recording material inputted by the inputting portion are different from directions of the front surface and the back surface of the recording material when the pressure-bonding printed matter is capable of being properly prepared.