Radiators dissipate heat from the system by filling a tank on one end and flowing liquid through copper veins that are connected to another tank on the other end. The veins are surrounded by fins to distribute the heat from the liquid in the veins. The fins are then cooled by the fans that push the heat out of the system.
The radiator is the most important component of cooling in the loop, the standard radiator size per component is 120mm and 240mm for overclocked components respectively. The larger the radiator, the more surface area there is to cool, thus less stress will be put on the system; however the thicker the radiator the more air-flow is required to push the heat of the radiator out of the system.
The most airflow is possible with a push-pull configuration in this scenario you would place the radiator between 2 fans. We recommend this with 60mm thick radiators.
There are two types of fans air flow fans (CFM or m3/h.) and static pressure fans (Pa or mmH20). Air flow is the mass of air that a fan can move over a given time. Static pressure is the fans capability to overcome obstacles. Static pressure is important to overcome dust filters and radiators in your build. Nowadays, most fans have a balance of both, an air flow value and static pressure value. The best type of fan to use with your radiator/s is a higher static pressure fan because static fan pressure is the ability for the fan to move air through static obstacles like radiator fins and dust covers.