It is very important that the ventilation in and around your PC is adequate, otherwise it can lead to overheating of the PC components and therefore damage to them. The best PC environment is one where the entire room has a regulated temperature, air conditioning and active ventilation. The most important aspect of proper ventilation for your PC, however, is to mainly make sure that you provide adequate space for the power supply fan (located at the back end of your PC) to blow. In other words it would be foolhardy to push your PC against a wall, or to place it inside a box. So be especially careful if your PC is placed under your desk, especially if it is a closed unit. Removing the metal cover of your PC will not help. Instead it will only make things worse as the power supply fan can no longer blow out the hot air from the PC components as the air flow will get spread out. Equally do not place papers on top of the ventilation grating of your monitor.
