Components often generate heat, which in some cases has to be dissipated, heatsinks are made for that. With conductive paste (thermal compound) between the chip and the heat sink, all irregularities are eliminated, making heat transfer as efficient as possible.
Andre KosterVentilator 40x20mm 24V 2pin - glijlagerDimensions are fine, cools well, therefore makes a bit of noise. Good material with print connector. Plug in and turn.
AlexGrille for fan 80 x 80mmNice standard finger protection, should not be missing with the fins as above.