The 80mm fans I mentioned are ~50 CFM each. It would be preferable to keep all cooling necessities (ducting, etc) inside the wooden box. Could something like a Peltier on intake cool the air inside the box sufficiently to negate the heat buildup from exhaust outside the box? How about a U piece of duct with water at the bottom so that the hot air is pulled through, perhaps with a system to cycle the water?

Thanks for the replies so far.
WaZ Reviewed by WaZ on . Cooling in small spaces A wooden box with dimensions 36"x20"x60" (25 cubic feet) sits inside a closed space measuring 37"x61"x93" (121 cubic feet). The closed space is used for storage and so actually has less room than that available. Is it possible to use a 400 watt HPS light with hood inside the wooden box and still maintain optimal temperatures? Preliminary tests suggest that temperatures easily exceed 100°F within the box, using 2-3 80mm fans each on intakes and outtakes. The light itself generates most of Rating: 5