Computer parts that get heated up fast are the CPU, Hard drive, graphics card and all integrated chips related Components. Those parts need a sufficient cooling system within the computer. Cooling fans are the mostly used devices for air cooling of computer parts like CPU, Chip sets, PSU, Hard disk and graphics card.

Cooling fan can be connected to the PC case, or attached to a CPU, chipset, PSU, hard disk or PCI slot. Notebook coolers are available in numerous sizes, that include 40, 60, 80, 92, 120, & 140 mm. Some large size fans in the range of 200mm to 240mm have began hitting the market in past few years.

The quantum of airflow produced by fans measured in cubic feet per min (CFM), and speed of rotation of the fan is measured in revolutions per min (RPM). Fans with greater CFM rating, but produce less noise (measured in decibels) are preferred. Some fans have an adjustable RPM rating to make less noise when the computer does not need extra air flow.

The speed of the cooling Fan could be regulated manually, thermally, or by the computer hardware or by software. In the case of laptops & notebooks, if the cooling fans aren't enough to cool the parts, then a laptop or notebook cooler is used for cooling . In this cooling is carried out by a cooling pad by passive or active cooling methods and rests below the laptop.

Active laptop cooling fans pass the air or liquid to take the heat away from laptop quickly, on the other hand a passive lap cooler uses thermally conductive materials for cooling purposes. Laptop cooling fan speed could be adjusted manually or automatically on different models. On many models, the fan runs at a set speed.

In passive laptop cooling, a conductive cooling pad allows for the cooling of a laptop without using any power. These "Pads" are loaded with an organic salt compound, that absorbs the heat from the laptop. Thus the usage of cooling fans and cooling pads are very significant to maintain the temperature in the allowable range. When the heat crosses the allowable range, then it can result in a CPU or a hard drive crash resulting in a complete breakdown. Mostly used home or small business systems uses fan cooling systems.

Many systems where the sound of the fans is a big hindrance come with heat sinks and convection cooling systems, where the noise made is very negligible. Often the motherboards would be totally immersed in liquid oil, that is an alternative to both cooling fans and heat sinks. Ionic wind cooling, which doesn't use any cooling fans or sinks are currently being researched by the researchers to find whether this technology could be used for cooling purposes.

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