I moved from a 600 to a 1k in a 4x4 and the tempature jumped to 86 degrees. Currently I have a 6" 400cfm fan. The air gets pulled into the scrubber, goes through the hood, and then pulled out by the fan. Its only going to get worse as the weather changes so I think a fan specifically for the hood would fix this. How many cfms would I want when the additional fan is just going to be used to cool the hood? How much would this help with the temps?