Cooling my grow tent under a 400 watt HID
My plants are in dire need. They are burning, leaves curling, etc. Moving my lights further away has helped but my grow tent remains too HOT! On an average day the tent will fluctuate between 80-99 degrees F. This is obviously too hot! In fact, I even have a tower fan inside the tent currently which doesnt seem to be helping whatsoever (hardly even a 1 degree difference). So my question is, how can I cool my tent?!?! Dimensions are 48"(L) x 24"(W) x 60"(H)(4ft x 2ft x 5ft) for anyone who cares to know.
I've been searching around eBay for some tent fans and have found some which will fit into pre-made 4'' holes in the grow tent. The air flow is 42.5 CFM on the fan which means nearly nothing to me. Should I even bother?
I appreciate any help, and so do my plants!!!