Its not a real laminar flow hood, but my adaptation between a real flow hood and the cheap ass version spouted by WillyMyco. I use a 20" Lasko Power Plus box fan on its highest setting, and a 20" MERV 16 filter taped together with gaffers tape as my "flow hood". I know it sounds stupid, but when following general sterile tek, it really works and more or less passes the lighter test. I tested this setup by putting open agar plates in front of the "flow hood" for 5, 10, 15, and 20 minutes, and then let them all incubate for a week and not a single speck of contamination grew on any of them. Since then I have also done about 40+ agar transfers, and another 30 grain inoculations with only about one contamination. I live in a one room studio that is a mycologists nightmare, and yet have had a phenomenal success rate. The whole setup costed only $150.