I'm going to be running a sealed room setup. The fan will only be used to cool the two hoods. Fresh air will be drawn in from outside, through both hoods, and exhausted back outside. Should be roughly 3 feet of ducting from intake flange to first hood. 2-3 feet of ducting between the hoods and another 3 feet from the second hood to the exhaust. There will be one 180 degree bend to serve as a light trap, but all other runs will straight.

I've just never fan two 1000w lights in a row before, my old setup has always been a pair of air cooled 600w each with their own fan, so not really sure how to calculate the cfm requirements for this new fan.
gbf4ever Reviewed by gbf4ever on . 2 x 1000w HPS Ventilation Question In the process of setting up my new room and just had a quick question. Plan on running 2 air cooled 1000w HPS in a row with one fan. Both hoods will be Magnum XXXL with 8" flanges. Will a 8" Max Fan rated at 667 CFM be enough to cool both of the hoods? The ducting run will be minimal, under 10' total. Plan to use sheet metal ducting for everything. From what I've been reading it should be plenty, but just wanted to get a few more opinions from people running a similar setup before Rating: 5