For those that are not familiar with this, it refers to the placement and direction of the radiator and cooling fans. This depends on the setup of your other fans as well. Get the right airflow and stick with it. For the most part, the direction of your radiator and fans won’t make a big difference. Those can be rigged as either intake or exhaust and the performance is around the same. Beyond that, keep the top of the radiator located above the pump.