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Computer fans commonly come in standard sizes, such as 92 mm, 120 mm (most common), 140 mm, and even 200–220 mm. Computer fans are powered and controlled using 3-pin or 4-pin fan connectors. Usage of a cooling fan
Fans may be fitted to the computer case or attached to CPUs, GPUs, chipsets, power supply units (PSUs), hard drives, or as cards plugged into an expansion slot. Common fan sizes include 40, 60, 80, 92, 120, and 140 mm. 200, 230, 250 and 300 mm fans are sometimes used in high-performance personal computers.
Noctua is an Austrian computer hardware manufacturer of CPU coolers and computer fans with a primary focus on the enthusiast market. The company's inception occurred in 2005 through a joint venture partnership between the Austrian company Rascom Computer distribution Ges.m.b.H., established in August 2000, [2] and the Taiwanese cooling specialist Kolink International Corporation.
These fans are designed to produce high static pressure with low noise, providing increased efficiency in the movement of air through a radiator when compared to an 'ordinary' case fan. These fans are available in several colour combinations, rotational speeds, and in sizes of 120 mm and 140 mm, the main two PC fan sizes. [17]
A standard cooling fan is a DC motor with blades attached. By varying the voltage input across the acceptable range for a fan, the speed of the fan will increase (to added voltage) and decrease (to reduced voltage); a faster fan means more air moved and thus a higher heat exchange rate.
Regardless of their placement, their purpose is either to let cool air into the case or to let hot air out. Larger vents usually allow cooling fans to be mounted via surrounding threaded screw holes. Newer cases include mountings for larger 120 mm or 140 mm cooling fans for quieter operation than the 80 mm fans formerly common.