Here is my new HL setup. It consists of a 2'x4' hydro hut. I have a 3' metal rack holding all the plants and lights. I have a 6" in-line duct fan connected to a 4" hole in the top of the hut. When closed I will get negative pressure insuring good air exchange. It sit's in my garage when the nights get down to the 40-50 depending on the season.
I'll get more pic's up soon.