I'm a first time grower...so please forgive my lack of knowledge. Well I finally got a 400w HPS Grow Light System for my closet....but now I'm having big problems. My avg temperature is up to 87 degrees!!! My closet space is roughly 2.5 x 6 x 6. I currently have a 4" intake system from my AC unit into the closet. It works pretty well...but now I need something to control the hot air from my HPS light. Currently, my only exhaust system is a small fan that's pushing air out at a very small rate...it's just not working well enough. It really looks like I need a proper Exhaust system. My reflector is a Sun System Yieldmaster with 6" air cooling fittings on each side. It also has a glass lense. Now here is my question.... Should I install a duct that runs from the 6" reflector fitting to the outside of my closet? If so, what type of inline fan will I need to suck the hot air away from the light? Does my exhaust need to be bigger than my intake? The same? Or does the intake need to be bigger? Thanks for the Help!!!! I really appreciate it.