I'm building a box with a grow space that is roughly 20"Lx20"Wx36" for one plant, I have a 150 watt CFL plus a 26 watt 6500K and a 42 Watt 2700K CFL lined up for it. I bought two ball bearing PC Fans, which are 3.1"x3.1"x1" with an ariflow of 37.37 CFM. I planning on having one pull air in and one push air out, after pulling it through a filter. I'm assuming that with a fan also blowing on the plant that the temps should be ok but I really want to try and get input before I have find out the hard way by building everything and checking temps. Any help would be huge.....