Carbon filters work, or alternatively you can make a multi-layer party tube from fabric softener sheets and exhaust thru that.

Or grow other fragrant herbs in your room. I had basil in my closet until I put it outside. Brush against it and the whole room smelled like an italian kitchen.

hey man looks quite sick. I really do enjoy seeing stuff like this. One thing i would try if i were you is to mount some t5 floros on the sides running vertical. This would promote more side growth, and with this type of box would make some great bud. I saw a guy do that with a trashcan grow and go 5 oz from 1 plant. pretty good if you ask me. The reason it works is cause the plants are able to get light to all the branches from the side lights while also getting light from the top light. This allows for maximum light penetration.