Hello. I hope this is the right place. A few days ago I purchased a nice sectional off craigslist that belonged to a smoker (I bought it because it's very nice and expensive but was cheap for that reason). I hired a professional cleaner who gave it an initial treatment that helped but there is still a smoke smell left. He has left me his Ozone generator for a week while he's on vacation. I believe this is the same model: https://www.activtek.net/CatalogProduct.aspx?ProductId=US50105B [Broken] I live in a ~900 square foot 1bedroom apartment and I have two cats. He told me that it was fine for me to run this generator while we're all inside. I double checked that online and I'm finding reports that these can be quite harmful. First, would using it for a few hours each day for a week cause any problems? Or is the danger of these machines something that happens after prolonged exposure? Do I need to run this while my cats and I are not inside? If so, how long do I need to stay outside after turning off the generator? I had planned on keeping my cats outside on my porch while I ran the generator for a few hours each day but my cats are inside cats so they freak out when I tried to keep them outside. I'm interested in learning if the cleaner was correct and that minimal exposure over just one week is truly harmless.