All evaporative coolers work with air suction, and there are evaporative pads in their suction path, which create a lot of resistance to the air flow and increase the engine power and also increase the dimensions of the cooler.
In the new cooler, air cooling or evaporation is done in the air exit, with this method, the dimensions of the cooler are significantly reduced and the air is cooled more, and there is no need for a water pump.