You control humidity to avoid rusting iron and steel. But a piano has certain wood parts, notably sounding board and tuning bed, that should not be dried out under any circumstances.

She's got a choice, either let 'em subject a very strong and old piano that is very stoutly built to a few hours of ozone or have a piano that smells like a house fire...

I'd take any chances with the ozone, which are likely very slim that any damage will be done. The damage has already been done, actually.


--Mac