Just like in the case of the dust build-up, obstructing air flow will affect the computer’s cooling system. However, this time, you risk doing this by covering the vents or by placing the tower too close to the wall. The same goes for laptops when you are holding the tower in a position that does not allow the vents to fully function.
We usually tell ourselves we were in a hurry, we were stressed and the computer was not working at full speed, to the full extent to the capacity we imagine it should have in our hour of need. Maybe we have grown accustomed so much to having one that we automatically think that should this one break down, we will definitely buy a new one, because it is such a great necessity. But what happens when we ruin that one as well? Also, new and upgraded versions are available on the market every year. Yet none of them are built to take ill use and poor management of resources.