Joan,
I don't know about the ozone, they are often called Negative Ion machines. They generate a stream of negative ions, which tend to nuetralize the static effect of smoke an soot particles, causing them to fall off, where they can be vacuumed or swept away. It's also that smell you'll get from a thunderstorm.

I hope that you are okay, and that your insurance and stuff will cover all of your losses and damages. I'm sooo sorry to hear that you had this happen to you, and I'm glad you're here to be asking this question.

I don't see that there is any reason that the machine would have any bad effect on the piano, though. Ask your technician, or ask the cleaning company to provide you with some documentation on it, so you'll feel comfortable.

Gary

I'm blessed watching God do what He does best. I've had a few rough years, and I'm still not back to where I want to be, but I'm on the way and things are looking far better now than what they were!