Patent ID: 8139974

Claim:
An exhaust device provided in an image forming apparatus having an image forming unit which form an image on a recording material by transferring a toner image borne on an image bearing member to the recording material, the exhaust device comprising: an exhaust unit that discharge air in the image forming apparatus to an outside of the image forming apparatus by generating an air current flowing from an inside to an outside of the image forming apparatus; a drive unit that drives the exhaust unit; and an exhaust control unit that controls the drive unit to drive the exhaust unit, the exhaust control unit including: a job counting unit that counts a number of image formation of one job in an image forming operation performed onto the recording material by the image forming unit, an image bearing member drive counting unit that integrates count values counted by the job counting unit from a point in time when starting the use of the image bearing member and calculates a number of driving times of the image bearing member, and an initial condition setting unit that sets an initial drive output value of the exhaust unit driven by the drive unit at a time of starting the image forming operation performed onto the recording material by the image forming unit based on a calculation value calculated by the image bearing member drive counting unit, the exhaust unit being controlled to be driven with the initial drive output value set by the initial condition setting unit at the time of starting the image forming operation performed onto the recording material by the image forming unit.