Canon imageCLASS 2300 Reference Manual page 32

I This machine generates a slight amount of ozone during normal use.
Although sensitivity to ozone may vary, this amount is not harmful. Ozone
may be more noticeable during extended use or long production runs,
especially in poorly ventilated rooms. It is recommended that the room be
appropriately ventilated, sufficient to maintain a comfortable working
environment, in areas of machine operation.
I For safety reasons, turn OFF the main power switch of the machine when it
will not be used for a long period of time, such as at night. As an added
safety measure, disconnect the power cord when the machine will not be
used for an extended period of time, such as over a long weekend.
Installation, Location, and Handling
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