Does anyone know the formula for the safe amount of ozone in a living area with a 600 mg/h output unit? the FDA says 100 ppb (parts per billion) is what is safe. This generator has different settings like for example run 2 mins every hour, 5 mins every hour 10 mins every hour up to 20 mins every hour . or 2 mins every 4 hrs, and so on up to 30 mins every 4 hrs. If anyone has ever don the math on this and whats safe the advice is greatly appreciated.