I have used a carbon filter in the past, but now I use an ozone generator, it kills any smell and helps protect the plant from infections or insects.
I run multiple carbon scrubbers and ozone.
Ozone simply kills any and all smells. It is unpleasant to breathe and bad for your health, but a neg pressure room going into an ozone filled room will be ideal.
Don't breathe it.
I want to spread the word about ozone after having tried it and been very impressed.
btw my ozone generator is rated at 3600 mg an hour, cap makes one that is 600. Mine is way overkill in a large basement, I generally run it for 30 mins on and 1-2 hours off or when i do laundry.
Also if you get a barebones kit from somewhere and a little fan to disperse and keep it cool you are looking at 100 dollars investment. And caps smaller probably equally efficient for your needs one is around that price also, maybe less depending on store.