@skunkd0c it's best to use ozone as an inline treatment in conjunction with negative pressure. Exhaust outdoors.
i have found that ozone is not necessary in the ducting for my situation
i vent from room to room i am able to smell the output directly it is odorless
if the carbon filter is not removing all the smell at the output of the extractor system i would suggest improving the carbon filter itself rather than using ozone
with enough negative pressure from very powerful fans and a practically sealed room i would not use the ozone, this level of extraction is not practical for my situation
i find ozone works best to keep the little leaks within the house i have at a more manageable level
also it can be used for smaller grows without any filter to keep the smell at a manageable level
when i enter the grow room opening the door of the room is enough to fill the house with smell when growing extra smelly strains
using ozone in the upper level of my house keeps the lower level smell free