Used in controlled situations it is safe. Used in a home environment it creates the possibility for health effects that the manufacturers due not mention. Attached is the full article I wrote for a bird list. At the bottom are citations provided by a toxicologist from Canada. The article is about parrots.
Birds have very sensitive respiratory systems.
The possible danger from ozone exposure is much greater for them. However, this danger is still possible for humans and ferrets. Ozone generators are air cleaners, not air filters. An air filter draws air through a filter of some kind. The filter material allows the air to past through but catches the air borne pollutants in the filter material.