Oce CS120 Reference Manual page 28

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The copier generates ozone while it is in use. However, the amount generated is not
enough to affect the human body. Nevertheless, fumes may be an annoyance if you make
a large amount of copies or use the copier for an extended period of time in a poorly
ventilated room. It is recommended that you ventilate the room to make the working
environment as comfortable as possible.
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For example, avoid installing the copier on unstable floors or stands.
About the Installation Location and Handling