That is by far the best book around and Ed Mccabe deserves a Humanity award! I dont know of many breathing Ozone machines but if you want to put any Ozone in an horifice of yours you should really use a Medical Grade/Oxygen feed unit because of NoX's. If you just want to drink ozone then any ambient ozonator will do such as Airzone, SOTA, WaterOz. WaterOz also do a Medical Grade but medical grade are more expensive.