Minolta PageWorks 18L - Manual (Page 7)

Foreword
v
OZONE RELEASE (For All Users)
During printer operation, a small quantity of ozone is released. This
amount is not large enough to harm anyone adversely. However, be
sure the room where the machine is being used has adequate ventila-
tion, especially if you are printing a high volume of materials, or if the
machine is being used continuously over a long period.
WARNING LABEL