All there is on the front is mylar. I was going to add black/white polymer, but i like the fact that during "day time", i can see through the tent, only in the front. I actually don't have a carbon filter. $200+ is an good investment for when the smell gets out of control. That won't be for a good 2 1/2 months though. I've got leaf from 5-6 different plants. Should I just throw it all together, and bubble it? or maybe keep them all seperate? I'm leaning more towards, just combining all of them.