Minolta MAGICOLOR 2 PLUS Manual page 127

The ozone filter reduces exhausted ozone gas.
1 Remove the ozone filter case on the left rear of the printer.
On the Duplex Model, use the plastic ridge on the right of its case to pry the ozone
filter case away from the printer.
CXE, GXE
2 Remove the ozone filter from the case.
3 Install a new ozone filter in the case.
4 Reinstall the ozone filter case.
5 Discard the old ozone filter.
EXD