Computer fan

A 3D illustration of six 80 mm fans, a type of fan commonly used in personal computers (sometimes as a set, or mixed with other fan sizes).

A small PC fan (30 mm, 2.56 CFM @ 8,000 rpm) lying on top of a much larger fan (250 mm, 124.71 CFM @ 800 rpm)

A computer fan is any fan inside, or attached to, a computer case used for active cooling, and may refer to fans that draw cooler air into the case from the outside, expel warm air from inside, or move air across a heat sink to cool a particular component. Generally these are found in axial and sometimes centrifugal forms. The former is sometimes called a "electric" fan, after the Rotron Vertical line,^[1] while the latter may be called a "biscuit blower" in some product literature.

Usage of a cooling fan[edit]

As processors, graphics cards, RAM and other components in computers have increased in speed and power consumption, the amount of heat produced by these components as a side-effect of normal operation has also increased. These components need to be kept within a specified temperature range to prevent overheating, instability, malfunction and damage leading to a shortened component lifespan.

While in earlier personal computers it was possible to cool most components using natural convection (passive cooling), many modern components require more effective active cooling. To cool these components, fans are used to move heated air away from the components and draw cooler air over them. Fans attached to components are usually used in combination with a heatsink to increase the area of heated surface in contact with the air, thereby improving the efficiency of cooling. Fan control is not always an automatic process. A computer's BIOS (basic input/output system) can control the speed of the built in fan system for the computer. A user can even supplement this function with additional cooling components or connect a manual fan controller with knobs that set fans to different speeds.^[2]

In the IBM compatible PC market, the computer's power supply unit (PSU) almost always uses an exhaust fan to expel warm air from the PSU. Active cooling on CPUs started to appear on the Intel 80486, and by 1997 was standard on all desktop processors.^[3] Chassis or case fans, usually one exhaust fan to expel heated air from the rear and optionally an intake fan to draw cooler air in through the front, became common with the arrival of the Pentium 4 in late 2000.^[3] A third vent fan in the side of the PC, often located over the CPU, is also common. The graphics processing unit (GPU) on most modern graphics cards also require a heatsink and one or more fans. In some cases, the northbridge chip on the motherboard has another heatsink and fan. Other components such as the hard drives and RAM may also be actively cooled, though as of 2012^[update] this remains relatively unusual. It is not uncommon to find five or more fans in a modern PC.

Cooling fan application[edit]

An 80×80×25 mm computer fan

Case mount[edit]

Fans from computer case - front and back

Used to aerate the case of the computer. The components inside the case cannot dissipate heat efficiently if the surrounding air is too hot. Case fans move air through the case, usually drawing cooler outside air in through the front or bottom (where it may also be drawn over the internal hard drive racks) and expelling it through the top or rear. Some ATX tower cases have one or more vents and mounting points in the left side panel where one or more fans may be installed to blow cool air directly onto the motherboard components and expansions cards, which are ones of the largest heat sources.

Standard axial case fans are 80, 92, 120, 140, 200 and 230 mm in width and length. As case fans are often the most readily visible form of cooling on a PC, decorative fans are widely available and may be lit with LEDs, made of UV-reactive plastic, and/or covered with decorative grilles. Decorative fans and accessories are popular with case modders. Air filters are often used over intake fans, to prevent dust from entering the case and clogging up the internal components. Heatsinks are especially vulnerable to being clogged up, as the insulating effect of the dust will rapidly degrade the heatsink's ability to dissipate heat.

While the power supply (PSU) contains a fan with few exceptions, it is not to be used for case ventilation. The hotter the PSU's intake air is, the hotter the PSU gets. As the PSU temperature rises, the conductivity of its internal components decrease. Decreased conductivity means that the PSU will convert more of the input electric energy into thermal energy (heat). This cycle of increasing temperature and decreased efficiency continues until the PSU either overheats, or its cooling fan is spinning fast enough to keep the PSU adequately supplied with comparatively cool air. The PSU is mainly bottom-mounted in modern PCs, having its own dedicated intake and exhaust vents, preferably with a dust filter in its intake vent.

CPU fan[edit]

Used to cool the CPU (central processing unit) heatsink. Effective cooling of a concentrated heat source such as a large-scale integrated circuit requires a heatsink, which may be cooled by a fan;^[4] use of a fan alone will not prevent overheating of the small chip.

Graphics card fan[edit]

A PCI Express 3.0 ×16 graphics card, using two fans for cooling

Used to cool the heatsink of the graphics processing unit or the memory on graphics cards. These fans were not necessary on older cards because of their low power dissipation, but most modern graphics cards designed for 3D graphics and gaming need their own dedicated cooling fans. Some of the higher powered cards can produce more heat than the CPU (dissipating up to 289 watts^[5]), so effective cooling is especially important. Since 2010, graphics cards have been released with either axial fans, or a centrifugal fan commonly known as a blower, turbo or squirrel cage fan.

Chipset fan[edit]

Used to cool the heatsink of the northbridge of a motherboard's chipset; this may be needed where the system bus is significantly overclocked and dissipates more power than as usual, but may otherwise be unnecessary. As more features of the chipset are integrated into the central processing unit, the role of the chipset has been reduced and the heat generation reduced also.

Hard drive cooling[edit]

Fans may be mounted next to or onto a hard disk drive for cooling purposes. Hard drives can produce considerable heat over time, and are heat sensitive components that should not operate at excessive temperatures. In many situations, natural convective cooling suffices, but in some cases fans may be required. These may include -

Faster-spinning hard disks with greater heat production. (As of 2011^[update] less expensive drives rotated at speeds up to 7,200 RPM; 10,000 and 15,000 RPM drives were available but generated more heat.)
Large or dense arrays of disks (including server systems where disks are typically mounted densely)
Any disks which, due to the enclosure or other location they are mounted in, cannot easily cool without fanned air.

Other purposes[edit]

Fans are, less commonly, used for other purposes such as:

Laptop computers lack large openings in the case for warm air to escape. The laptop may be placed on a cooler - somewhat like a tray with fans built in - to ensure adequate cooling.
Expansion slot fan – a fan mounted in one of the PCI or PCI Express slots, usually to supply additional cooling to the graphics cards, or to expansion cards in general.
Optical drive fan – some internal CD and/or DVD burners included cooling fans.
Memory fan – modern computer memory can generate enough heat that active cooling may be necessary, usually in the form of small fans positioned above the memory chips. This applies especially when the memory is overclocked or overvolted,^[6] or when the memory modules include active logic, such as when a system uses Fully Buffered DIMMs (FB-DIMMs).^[7] However, with newer lower voltages in use, such as 1.2v DDR4, this is less commonly needed than used to be the case.^{[citation needed]}. Most of the time memory modules, located close to CPU will receive enough of the air flow from the case or CPU fan, even if the air from CPU fan and radiator is warm. If the main CPU is water cooled, this small amount of airflow might be missing, and additional care about some airflow in a case or a dedicated memory cooling is required. Unfortunately most memory modules do not provide temperature monitoring to easily measure it.
High power voltage regulators (VRM) often using switch mode power supplies do generate some heat due to power losses, mostly in the power MOSFET and in an inductor (choke). These, especially in overclocking situations require active cooling fan together with heatsink. Most of the MOSFETs will operate correctly at very high temperature, but their efficiency will be lowered and potentially lifespan limited. Proximity of electrolytic capacitors to a source of heat, will decrease their lifespan considerably and end in a progressivly higher power losses and eventual (catastrophic) failure.
Some high-end machines (including many servers) or when additional reliability is required, other chips like SATA/SAS controller, high speed networking controllers (40Gbps Ethernet, Infiniband), PCIe switches, cooprocessor cards (for example some Xeon Phi), some FPGA chips, south bridges are also actively cooled with a heatsink and a dedicated fan. These can be on a main motherboard itself or as a separate add-on board, often via PCIe card.

Physical characteristics[edit]

Due to the low pressure, high volume air flows they create, most fans used in computers are of the axial flow type; centrifugal and crossflow fans type.^[8] Two important functional specifications are the airflow that can be moved, typically stated in cubic feet per minute (CFM), and static pressure.^[9] Given in decibels, the sound volume figure can be also very important for home and office computers; larger fans are generally quieter for the same CFM.

Many gamers, case modders, and enthusiasts utilize fans illuminated with colored LED lights. Multi-colored fans are also available.

Dimensions[edit]

The dimensions and mounting holes must suit the equipment that uses the fan. Square-framed fans are usually used, but round frames are also used, often so that a larger fan than the mounting holes would otherwise allow can be used (e.g., a 120 mm fan with holes for the corners of a 90 mm square fan). The width of square fans and the diameter of round ones are usually stated in millimeters. The dimension given is the outside width of the fan, not the distance between mounting holes. Common sizes include 40 mm, 60 mm, 80 mm, 92 mm, 120 mm and 140 mm, although 8 mm,^[10] 17 mm,^[11] 20 mm,^[12] 25 mm,^[13] 30 mm,^[14] 35 mm,^[15] 38 mm,^[16] 45 mm,^[17] 50 mm,^[18] 70 mm,^[19] 250 mm^[20] and 360 mm^[21] sizes are also available. Heights are typically 10 mm, 25 mm or 38 mm, but this is usually not an important dimension as it does not affect mounting holes or apertures in the case.

Typically, square 120 mm and 140 mm case and power supply fans are used where cooling requirements are demanding, as for computers used to play games, and for quieter operation at lower speeds. 80 mm and 92 mm fans are used in less demanding applications, or where larger fans would not be compatible. Smaller fans are usually used for cooling CPUs, graphics cards, northbridges, etc.

Screw hole spacings and fan sizes:

32mm between screw holes - 40mm fan size
40mm between screw holes - 50mm fan size
50mm between screw holes - 60mm fan size
60mm between screw holes - 70mm fan size
72mm between screw holes - 80mm fan size
83mm between screw holes - 92mm fan size
105mm between screw holes - 120mm fan size
124.5mm between screw holes - 140mm fan size
154mm between screw holes - 200mm fan size
170mm between screw holes - 220mm fan size

Rotational speed[edit]

The speed of rotation (specified in revolutions per minute, RPM) together with the static pressure determine the airflow for a given fan. Where noise is an issue, larger, slower-turning fans are quieter than smaller, faster fans that can move the same airflow. Fan noise has been found to be roughly proportional to the fifth power of fan speed; halving the speed reduces the noise by about 15 dB.^[22] Axial fans may rotate at speeds of up to around 23,000 rpm for smaller sizes.^[23]

Fans may be controlled by sensors and circuits that reduce their speed when temperature is not high, leading to quieter operation, longer life, and lower power consumption than fixed-speed fans. Fan lifetimes are usually quoted under the assumption of running at maximum speed and at a fixed ambient temperature.

Air pressure and flow[edit]

A fan with high static pressure is more effective at forcing air through restricted spaces, such as the gaps between a radiator or heatsink; static pressure is more important than airflow in CFM when choosing a fan for use with a heatsink. The relative importance of static pressure depends on the degree to which the airflow is restricted by geometry; static pressure becomes more important as the spacing between heatsink fins decreases. Static pressure is usually stated in either mm Hg or mm H₂O.

Bearing types[edit]

The type of bearing used in a fan can affect its performance and noise. Most computer fans use one of the following bearing types:

Sleeve bearings use two surfaces lubricated with oil or grease as a friction contact. They often use porous sintered sleeves to be self-lubricating, requiring only infrequent maintenance or replacement. Sleeve bearings are less durable at higher temperatures as the contact surfaces wear and the lubricant dries up, eventually leading to failure; however, lifetime is similar to that of ball-bearing types (generally a little less) at relatively low ambient temperatures.^[24] Sleeve bearings may be more likely to fail at higher temperatures, and may perform poorly when mounted in any orientation other than vertical. The typical lifespan of a sleeve-bearing fan may be around 30,000 hours at 50 °C. Fans that use sleeve bearings are generally cheaper than fans that use ball bearings, and are quieter at lower speeds early in their life, but can become noisy as they age.^[24]
Rifle bearings are similar to sleeve bearings, but are quieter and have almost as much lifespan as ball bearings. The bearing has a spiral groove in it that pumps fluid from a reservoir. This allows them to be safely mounted with the shaft horizontal (unlike sleeve bearings), since the fluid being pumped lubricates the top of the shaft.^[25] The pumping also ensures sufficient lubricant on the shaft, reducing noise, and increasing lifespan.
Ball bearings: Though generally more expensive, ball bearing fans do not suffer the same orientation limitations as sleeve bearing fans, are more durable at higher temperatures, and are quieter than sleeve-bearing fans at higher rotation speeds. The typical lifespan of a ball bearing fan may be over 60,000 hours at 50 °C.^[24]
Fluid bearings have the advantages of near-silent operation and high life expectancy (comparable to ball bearings), but tend to be the most expensive.
Magnetic bearings or maglev bearings, in which the fan is repelled from the bearing by magnetism.

Connectors[edit]

Three-pin connector on a computer fan

Connectors usually used for computer fans are the following:

Three-pin Molex connector KK family: This Molex connector is used when connecting a fan to the motherboard or other circuit board. It is a small, thick, rectangular in-line female connector with two polarizing tabs on the outer-most edge of one long side. Pins are square and on a 0.1 inch (2.54 mm) pitch. The three pins are used for ground, +12 V power, and a tachometer signal. The Molex part number of receptacle is 22-01-3037. The Molex part number of the individual crimp contacts is 08-50-0114. The matching PCB header Molex part number is 22-23-2031.

Four-pin Molex connector KK family: This is a special variant of the Molex KK connector with four pins but with the locking/polarisation features of a three-pin connector. The additional pin is used for a pulse-width modulation signal to provide variable speed control.^[26] These can be plugged into 3-pin headers, but will lose their fan speed control. The Molex part number of receptacle is 47054-1000. The Molex part number of individual crimp contacts is 08-50-0114. The Molex part number of the header is 47053-1000.

Four-pin Molex connector: This connector is used when connecting the fan directly to the power supply. It consists of two wires (yellow/12 V and black/ground) leading to and splicing into a large in-line four-pin male-to-female Molex connector. This is the same connector as used on hard drives before the SATA became standard.

Three-pin Molex connector PicoBlade family: This connector is used with notebook fans or when connecting the fan to the video card.

Dell proprietary: This proprietary Dell connector is an expansion of a simple three-pin female IC connector by adding two tabs to the middle of the connector on one side and a lock-tab on the other side. The size and spacing of the pin sockets is identical to a standard three-pin female IC connector and three-pin Molex connector. Some models have the wiring of the white wire (speed sensor) in the middle, whereas the standard 3-pin Molex connector requires the white wire as pin #3, thus compatibility issues may exist.

Alternatives[edit]

If a fan is not desirable, because of noise, reliability, or environmental concerns, there are some alternatives. Some improvement can be achieved by eliminating all fans except one in the power supply which also draws hot air out of the case.^[27]

Systems can be designed to use passive cooling alone, reducing noise and eliminating moving parts that may fail. This can be achieved by:

Natural convection cooling: carefully designed, correctly oriented, and sufficiently large heatsinks can dissipate up to 100 W by natural convection alone
Heatpipes to transfer heat out of the case
Undervolting or underclocking to reduce power dissipation
Submersive liquid cooling, placing the motherboard in a non-electrically conductive fluid, provides excellent convection cooling and protects from humidity and water without the need for heatsinks or fans. Special care must be taken to ensure compatibility with adhesives and sealants used on the motherboard and ICs. This solution is used in some external environments such as wireless equipment located in the wild.^{[citation needed]}

Other methods of cooling include:

Water cooling
Mineral Oil
Liquid Nitrogen
Refrigeration, e.g. by Peltier effect devices
Ionic wind cooling is being researched, whereby air is moved by ionizing air between two electrodes. This replaces the fan and has the advantage of no moving parts^[28] and less noise.^[29]