[banditpowdercoat]

It all depends on what your trying to do. But if your just trying to remove canopy heat from the lights, Pull. But fan will get corroded. The Push Pull config will work great on a fairly sealed canopy. That is, if the canopy doesnt have enough air leaks to match the fans CFM. But the total air exchanged that way is 1 fans CFM rating. If both fans are in the same direction, ie Blowing out, the CFM is the addition of the 2 fans, more air volume.. If wanting to cool the water itself, through evaporation, then blowing on the water obviously is best.