so I am flirting with the idea of making a thread screen in my 3 and a half feet high speaker grow box. It has bear minimum lighting, a single intake fan, and has an exhaust port out the front. I was wondering at what height should i put the screen, I know it all depends on how the plant grows and stuff, but I want an idea of where I should put it, like the ballpark, also I am using bagseed.