An ozone generator is a no no. I use a very good quality oil burner and burn pure lemongrass oil outside of my grow room. Before using it my entire house smells like weed after using it my house smells like fresh lemongrass it truly works.
Note
As long as it’s outside your grow room there’s no threat of fragrance in your plants whatsoever. I even open my grow room door for about an hour and let all the funk out into the house and the smells killed almost instantaneously