[jonumberone]

Justin,
I should mention that I have a whole house air cleaner/purifier attached to my furnace/ac that also produces ozone, tho at much lower levels than the machines being discussed here. Some form of climate control is in effect at my house 99% of the days, and I imagine some amount of ozone is present around the clock in my house. I usually run the machine I mentioned earlier for 15 to 20 min (about a 1/4 turn on the knob). How much Ozone is produced in that 20 min Vs all day by my furnace I don't know, so I can't answer your question in regards to these machines but I haven't noticed any issue with regards to long term exposure.