Air should travel in clear path through the case.
Pc radiator fan direction.
If you mount the radiator and its fans too close to a device pushing air in the opposite direction it can cause a stalemate with the air and in turn give you higher temperatures.
If possible mount your radiator and fans as exhaust fans.
You should also heed the placement of the fans.
When looking at our fans the front or intake side of the fan will always be the side that has the cooler master logo in the center of the blades.
By changing the direction a fan is mounted it can act as either an intake or exhaust.
Generally you want the case fans in front of the case drawing in air while the fans at the rear blow air out.
The radiator and fan combo itself can be mounted to the front or bottom for intake or the rear or top for exhaust but it will be less efficient than a fan alone.
The rear or exhaust side the side that the air comes out of of our fans will always be the side that houses the fan motor.
A journey to best pc cooling fan setting.
How to determine the airflow direction of your case fans.
This means air is flowing into the case and hot air from the cpu.