My old setup was a dr60 tent (2x2x5, tiny) with a 400w HPS, diy cool tube and 6” exhaust fan. There was no room inside the tent for anything except plants, ducting and light fixture. The ballast, fan and filter all needed to be outside the tent. Since my exhaust fan was total overkill, it allowed me to push air through the filter instead of pulling. It worked great, but much less efficient than pulling though the filter. It didn’t blow any carbon or dust at all, I was using a 4” can filter with a reducer.