Processor fan blow in or blow out

Determining the type of fan

Many people have a question about how to determine whether the fan is blowing or blowing out? It is fairly easy to do, the direction of the blades will help. If the unit is on blow, the blades are raked downward. Moves counterclockwise. The housings of today’s computer cooling units have arrows that represent the rotational direction and the direction of airflow. Any unit has two arrows. One arrow shows where the blades go, the other arrow shows the direction of flow.

Friends, did I put the coolers in the PC correctly?

I have LIAN LI O11 AIR case and I will show you the location of coolers in my PC by the example of its official photo.

There are 2 coolers on the bottom. the AeroCool Rev 120mm coolers which are marked with red dots and blows air upwards.

On the right side relative to the front blows one AerCool Rev 120mm which is also marked with a red dot.

The almost straight line at the top points to the 3 section watercooler that blows air up out of the cpu.

I have a pretty hot PC so the location of the coolers probably plays a role:

AMD RYZEN 7 5800X GTX 1080 TI of the hottest.

Correct. In a kid’s PC the coolers should suck the dust off the floor so the kid doesn’t have to vacuum)

In a kid’s PC the coolers should suck up the dust and crumbs from the table so the kid doesn’t have to clean it up

When you open it in a couple of months, there’s a loaf of bread.

And there’s Grigorovich playing backgammon with Baton.

Fuck you 🙂 In fact the location is fine, except that the side fan is not really needed and creates more noise than useful. I have to control all this stuff depending on the real temperature of the components, or else it will roar like a helicopter at idle. I have a water cooled computer in a Corsair 900d case, I had a 1080 too, the card is fine. In full HD you can still play all the games at maxima.

I left one on the bottom and the other on the bottom put it on the front panel on the air in, now even better)

A, if the front you have them were not (from the picture is not very clear) is certainly better to put there. I have a dust filter in the bottom of the case for sure. Usually they are easy to remove and wash, and the airflow is not so bad that it sucks dust from the floor or the table like a vacuum cleaner.

I have a lot less coolers than in the picture, the coolers I have in the picture are marked with a red dot, the front was not at all

You can’t eat like a normal person at the dinner table? You eat like a pig, you can’t stop playing for 10 minutes?

That’s the most important thing nowadays, with a system like this you get tired of dusting it

It’s ok, if there are filters underneath and in front, there will be no dust in the case. I have a computer like that, 24/7, it’s clean

Been watching different technobloggers on this as I put together my own cooler for my computer in mid 2020. And the question of coolers was always a burning issue. Through trial and error I derived a formula for optimal performance (as it is at my place) Two 120mm coolers on top are to blow air into the computer and the front and rear coolers are to blow air out of the case. Thanks to that, the inside parts don’t get too hot. But I have a computer on the floor.

Right. In PC chicks, the coolers should blow dust out of the PC, so you can vacuum it up later.)

Please promote this comment to the top. The man at least put a normal cooling

I understand the red marked where installed and out. herobora, to be honest. The intake air space is too small, it’s gonna suck up all the shit that’s sitting around and make the intake airflow ineffective at all. I understand that MB was based on the logic that hot air rises, but. You have a limited amount of cool air flow, the video card blocks a part of the flow to the components, and you blow not into the grille of the video, and in its design housing for the most part. Т.е. You’re not blowing much of the PC’s air because the video card is blocking the already debatable airflow to them. I’ll say nothing about the overall behavior of cold and hot air, not to start a cholivar.

I drew a picture of how normal guys normally do it. The logic is insanely simple.

Now the top spinners on the contrary gained relevance, video cards have powerful CO, flow, respectively, too (based on the example of 3080 telling), just can be heated in cold days from the top spinners, if 100% card speed up, I can not imagine that without them would be.

Wait, I’ve got a pump on top, not just a fan

Powerful card in general turns the system into a real heater, you must either create a hurricane inside or the air from the graphics card begins to heat other components, as a result, a new graphics card also switched to water, the difference is very noticeable in both temperature and noise.

I totally agree. Without the video card and a description of its cooling system talk about nothing. The PSU is not in the diagram yet, it also pumps air, but since it’s not there, it’s not clear from where.

The PSU is installed behind the motherboard, it’s fine there, it’s separate

And the card? Is it a blowing turbine or just 3 vortexes on a regular radiator?

The ones underneath are not only almost useless in terms of cooling, but they will also suck up dust perfectly

Where? Main coolers. That’s 3 in the front and 1 in the back. The ones on top don’t do much for you.

I only have one vent on the right side. Maybe they could be put on the front so they would blow cool air directly to the graphics card instead of underneath

I mean, you have 3 in the picture at the front. Or do you only have the ones marked in red? The side cooler is a weird thing, what the fuck do you need it for if you could do it humanly. 3 in the front

I only have the ones marked in red, the rest are just from the promotional picture of the case.

three in the front for air intake. definitely. In the back there’s one or two blowers. also. All the rest. is optional and gives very little, the main airflow comes from 3 coolers at the front (unless you have monolithic plastic and there’s no place to get air)

Two in the front is good enough in most cases. But two screws on the coffin’s ass is some kind of exoticism. The hot air will accumulate at the top anyway, the second will work at best at half strength. That’s good, of course, but it’s too much.

I can only get 80mm on the air outlet in my case, that’s fine?

I’ve got one big one on the blow. handles it. You’ve got three more on top, you’d be fine with them. Here’s the fuckin’ thing. Blue is the cold air flow. The red is the hot air as it should go and where it appears

You have exactly two hot spots in your PC. Video card and CPU. The air to the cpu and the videocard comes from the front 3 coolers, blown from the cpu by the rear cooler, from the videocard. with them, too. The top blowers are like a small support. The one you have on the right side. I don’t know what it’s for, at most it’s for blowing in to add extra cold air

Oh, shit, you got a waterboard on your CPU. Then you need to worry about cold air access to the graphics card and about ways to get it out of the computer

No thankfully coolers are possible in the front but I originally wanted a glass front model

there is a trial and error method to monitor the temperature and rearrange the fans, and you can also bother to calculate the incoming and outgoing air flows, they should be about equal

You need them to knock a couple of degrees off your graphics card. If you have filters there’ll be no dust at all

Put a radiator on top to blow, two/three on the front to blow and one on the back to blow.

You can go straight to “Positive Pressure”

I’ve never understood the fun of putting the water bottle on top, the radiator sucks the hot air from the graphics card and VRM. You have to put the water intake on the front (or the side if you have an open case like the TT Core P3)

so it blows hot air through and out of the case?

That’s what he says. Try it yourself and monitor the temperatures. I’ve personally tried both the top blowout and the front blowout. Not only is the CPU cooled by boiling water from the graphics card if the top is blowing out and that adds up to 5-10 degrees for a 3-section Aio, but the graphics card gets hotter too if there is no airflow from the front/bottom pile

If you put aio front, no boiling there will not be, the temperature of the fluid in the water cooler in the gaming load will be about 40 degrees, and the air that passes through the honeycomb will naturally cooler and they will cool the graphics card, and up of the video card, all this boiling water and will be out, above will be hot air blown. So for the video card and for the CPU is the best option. There are three in the front blowing in through the water valve and at least that many on the top blowing out.

You should take a lot of mothers’ bloggers that do synthetic tests of either the CPU or the video card, and then you read the reviews how their cards are at 80 degrees with 2000 rpm

How do you tell which side is blowing in/out?? On the side of the frame there is a marking of the direction of air flow with an arrow. If suddenly there is no marking, you can determine by the shape of the blades. The side where they’re concave, the air is blowing out.

Always turn fans on when it is cooler outside than inside the house. Always turn fans off, remove them from the window, and close the windows as soon as the air is cooler in the house. The principle of the fans is that there should be an average between day and night temperature in the house.

The fan on the cooler should blow air through the radiator, thereby cooling it. That is, the fan on the processor cooler must blow toward the processor. On some cooler models the fan is installed on a separate heatsink.

Answering the question posed in the title of the text, we can safely say that in the case of gaming computers should have at least four fans. two mounted in the front and two behind. On the other hand, if you have a case with a peorized top, it is worth adding one or two fans on top.

Cooler. Cooler) is a cooling system in computer equipment. A fan is a device for creating air movement, consisting of rotating blades. A cooler uses a fan and a radiator. That is, the fan is part of the cooler mechanism.

If the machine is blowing, the blades are raked downward. The movement is counterclockwise. Cases of today’s computer cooling elements have arrows that represent the rotational direction and direction of airflow. Every machine has two blades.

Many people have questions about how to determine whether a fan is intake or exhaust? It is quite simple to do, the direction of the blades will help. If the unit is blowing, the blades are raked in a downward direction. The movement is counterclockwise.

If the machine is blow-out, the blades are raked downward. The movement is counterclockwise. The housings of today’s computer cooling units have arrows that represent the rotational direction and the direction of airflow. Every machine has two arrows.

Blowing in or blowing out?

First of all about the terms (used in common parlance or by “craftsmen from soils” who don’t understand the processes) “blowing in” or “blowing out”, first of all, we must learn the terms generally accepted in techniques and literature “blowing” or “exhaust” fans.

Back in 2005 there was written an article “Fan connection diagrams for PC system unit cooling”, where three typical fan connection diagrams were considered, which allows to estimate advantages and disadvantages of any scheme.

  • two exhaust fans (the most common, for example, one extraction fan of the PSU and an additional case extraction fan). The special case of the given scheme is N ( N = 1,2,3. ) exhaust fans or the same number of blowers;
  • one exhaust and one blower;
  • Different number of exhaust and blowing fans.

May be the above mentioned article is difficult to understand, but believe me, those who are engaged in modification of cases ventilation should understand what they do.

And most importantly, the quality of ventilation, often does not depend on the number of fans. Improperly balanced air exchange, as a result of installing fans with arbitrary characteristics, will not improve, but rather the opposite will worsen the ventilation.

Everything you do must be calculated (evaluated), at least approximately.

Fans of blower fans.

Advocates of blower fans, or of fans in excess of exhaust fans, often give a killer, as they think, argument:

But what kind of air do they use to create that overpressure??

That’s where the dust is.

The efficiency of the ventilation system (heat extraction system) is determined by the amount of air flowing through the enclosure. Similarly, the greater the amount of dust that remains in the enclosure, the more air that goes through the enclosure.

That is, the amount of dust that remains in the computer enclosure does not depend on the air intake or exhaust (direction of the fans), but only on the amount of air passing through the enclosure.

Those who struggle with dust may be advised to read the article “Dust and protection from it of PC and REA”.

The only way to combat the dust is to filter the air entering the PC enclosure from it.

But the filter must be designed to trap most of the dust and at the same time have low aerodynamic resistance (see also. article). Not to bore you with numbers, I will try to give you the minimum. The overpressure of axial fans used to force air through an enclosure is usually from 1-3 mm. H 2 O for low-noise (low-speed) fans up to 15-20 mm. H 2 O for high performance fans with up to 50 dB noise level. In order that your fans do not significantly reduce their performance, the overpressure loss on the filter should not exceed at least 10%, and in absolute values it is 0.1. 0.5 mm. H 2 O. It is a very low resistance filter. over, the filter must be monitored. (The method is described in “Extreme Case Part 5”) Otherwise you risk overheating of PC components unexpectedly, when the filter limits the airflow through the case to a critical value due to the dust it collects.

A few words about the organization of ventilation of PC cases.

As shown in the article “Fan circuits for PC system unit cooling” the best scheme in terms of cooling efficiency is “all exhaust fans”. In this case, with simple implementation, for PC enclosures with small and medium aerodynamic resistance, the greatest increase in air flow rate is provided by installation of additional fan. And this means the greatest increase in heat output from these enclosures.

A simplification can be used to simplify the calculations:

  • The use of schemes containing the group N of fans working in one direction with the same positive pressure is equivalent to the use of one fan with the flow equal to the sum of discharges.
  • Using circuits containing one supply and one exhaust fan, with equal flow rates, is equivalent to using one exhaust fan with total overpressure.

The application of the scheme with the exhaust and blower fans gives the highest increase of air consumption at the PC cases with high aerodynamic resistance, but it has one very essential drawback. In an unbalanced system where the total inlet fan flow differs greatly from the total outlet fan flow, the performance may be degraded rather than improved (as discussed above).

In case of excess flow of exhaust fans over the discharge ones, it leads the latter to the vane mode, and vice versa. In a scheme, a blower or a group of blowers. One or more exhaust fans or their group always switch to the vane mode with a lower flow rate. Vane mode. mode of a fan operating in an air stream at a higher flow than the fan can produce. It is characterized by limitation of air stream through the fan at the level of its nameplate value (corresponding to the number of revolutions at the moment and its flow characteristic) working in vane mode

air (volumetric amount) is blown out of the PC enclosure than enters it. Due to the heating of the air in the PC enclosure, its volume increases, and the more it heats up. The balance of performance of the fans (taking into account the heating of the air) must be observed rather precisely. Any violation of it puts the fan out of balance into a vane mode. In other words, such fan starts working as an air flow limiter, which leads to redistribution of overpressure of the fan with high flow in the chain “blower. case. exhaust” fan. As a result the overpressure of high-flow fan (this chain) from PC case volume is redistributed with “minus” sign to the fan that works in vane mode. Air flow through the case drops to the level of flow of the fan that works in the vane mode.

In conditions when heat dissipation in PC case is variable, realization of such scheme will give essential positive effect only in the presence of sophisticated fan control system.

Excessive pressure.

Logic suggests that the higher the pressure in the PC case the higher the density (specific gravity) of the air, more heat is transferred to the air increasing the heat dissipation from it.

Investigation: Should fans be blowing in or out? The results may surprise you!

If you are interested in the formulas you can see the article “The Art of Cooling” and the formula [3].

If the air density (specific weight) doubles, which corresponds to an increase of pressure in it twice (up to 2 atm), the heat power withdrawn by the air also doubles. Significant gain.

Just a solid case and a 2 atm compressor.

Then it is easier to put your PC in oil, as some experimenters do.

Now let’s see if there is a gain in typical systems.

In a real PC case, the pressure may differ from atmospheric pressure by 1 to 5 mm. H 2 O with plus sign for overpressure in case of using delivery fans or with minus sign in case of using exhaust fans.

The above mentioned 1. 5 mm. H 2 O is 1. 5 x10 Kg/m 2 or 1. 5 x10.4 kg/cm2. ( this pressure gives a proportional increase in pressure ) so the gain or drop in heat transfer is 1×10.2 %.

processor, blow

So if you can raise the pressure to 2-3 atm, then go ahead and win.

But is it worth for the sake of 0.01% (think about how many W for your PC) to put a powerful (noisy) fan, to seal the case (which is generally stupid, because it deprives the case of air exchange and respectively. cooling) and go on other adventures?

processor, blow

Installation of additional fans.

Let’s look at the main points of correct installation of case fans for most system units. Here we give tips exactly for standard cases, because for non-standard cases arrangement of the fans is so diverse that there is no point in describing them. everything is individual. over the size of non standard cases fans can be up to 30 cm in diameter. But nevertheless some cooling aspects of custom PC cases are considered in the following article Correct cooling for custom PC cases.

No extra fans in the case.

This is a standard layout for almost all computers sold in stores. All the hot air rises to the top of the computer and is forced by the fan in the power supply to the outside.

The big disadvantage of this type of cooling is that all the heated air passes through the power supply, heating it even more. And that is why the power supply unit of such computers breaks down more often. Also all the cold air is sucked in from all the slots in the case instead of controlled, which only reduces the efficiency of the heat transfer. Another drawback is the thin air produced by this type of cooling, which leads to dust accumulation inside the case. But still, it is in any case better than the improper installation of additional fans.

One fan on the back of the case.

This method is used more out of futility, as there is only one place in the case to install an additional cooler. on the back wall under the power supply. To reduce the amount of hot air flowing through the power supply, a single fan is installed that blows air out of the case.

Most of the heated air from the motherboard, CPU, graphics card, and hard drives blows out through the extra fan. And the power supply gets significantly less warm. Also the overall flow of moving air increases. But the vacuum increases, so the dust will accumulate even more.

Additional front fan in the case.

When your enclosure has only one front seat or there is no possibility to fit two fans at the same time (no place to plug them in), this is the ideal solution for you. One fan must be installed “blowing” in the front of the case.

The fan should be installed in front of the hard drives. It would be more correct to write that the hard drives should be placed in front of the fan. So the cold incoming air will immediately blow over them. This installation is much more effective than the previous one. Directional airflow is created. Reduces the vacuum inside your computer so dust is not trapped. If you power additional coolers from the motherboard, the overall noise is reduced because the fan speed is lowered.

processor, blow

Two fans installed in the case.

The most effective method to install fans for extra cooling of the system unit. A fan must be installed on the front of the case to blow air in and a fan on the back of the case to blow air out:

It creates a powerful, constant airflow and directional flow. The power supply works without overheating because the heated air is expelled by the fan installed underneath it. If a power supply with adjustable fan speed is installed, the overall noise level will be significantly reduced and more importantly the pressure inside the case will be balanced. Dust is prevented.

Proper computer cooling

It is no secret that a computer heats up all of its electronic components when it is running. Some components become very hot. The CPU, graphic card and motherboard’s north and south axes are the warmest parts of your PC. Even when your computer is idle their temperature can reach 50-60 degrees Celsius. But if the system unit is not periodically cleaned of dust, the heating of the main components of the computer becomes even more. Increased heat causes the computer to constantly freeze, the fans are running at high speed, resulting in an annoying noise. Overheating in general is dangerous and causes the computer to crash.

Therefore, the main problem of all electronic parts of computer technology is the proper cooling and efficient heat dissipation. The vast majority of computers, both industrial and domestic, for the removal of heat used air cooling. It is popular due to its simplicity and low cost. The principle of this type of cooling is as follows. All heat from the heated elements is given to the ambient air, and the hot air, in turn, is removed from the system unit with the help of fans. To improve heat dissipation and cooling efficiency, the most heated components are equipped with copper or aluminum radiators with fans mounted on them.

But the fact that heat is removed by air movement does not mean that the more fans installed, the better cooling in general. Several improperly installed fans can do much more damage than solve the problem of overheating, when one properly installed fan will solve the problem very effectively.

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