there is an eight foot tall down draft skimmer at the local university here and its cool as hell but when I was looking at it I asked how hard it was to clean and the guys I was talking to were dreading it the breakdown time was ridiculous so it got crudded up and didnt work as well, when clean they said it was awesome. but no one wants to clean it because its a PITA. but thats just heresay. I would try one out..... I have parts maybe I can build one. hm,mmm.