Too many component failures can be attributed to having never cleaned the circuit board and heat sinks. Fans need blades wiped to reduce imbalance and premature bearing failure. Some of the old equipment I have cannibalized were so loaded with dirt and dust motts inside, it was embarrassing. And messy.
Fans may not fail but sleeve bearings can dry out and sound like WW II London during a blitz. Brushes wear down to zip and the curtain drops.
Air movement is magic. Moving air past the epoxy heatsinks on my Mega drops interior heatsink temp twenty degrees. Moving air on 90mm star LED heatsinks allows a heatsink designed to run one 10-watt chip be fitted with TWO and run substantially cooler than the single chip heatsink relying on convection cooling alone.