Perforated housing cover or blind – which is better

Finding a suitable PC case is more difficult than a graphics card or any other element of a computer. Design, cooling methods, sound insulation, roominess, quality of materials and other parameters make this choice difficult. Here we will discuss the top and front covers of the case, what effect the perforation has on the quality of cooling and the noise level.

Stove principle
To begin with, let’s deal with a popular myth: the removed side / front cover helps to cool. And in order to somehow figure out which type of lids is better, we will have to recall the school physics course. According to the law of thermodynamics, warm air rushes up, cold air rushes down:

The classic scheme: an air blower from below picks up air at room temperature, drives it through the case. Due to the temperature difference, hotter elements give off heat to the cold air, warming it up. The blowing fan located under the cover draws warm air masses from the housing. That is, our PC is a classic brazier.

The screenshot shows computer modulation in Solid Works PC software with the side cover removed. Cold air masses are indicated in blue, hot air masses are indicated in red. As seen in the image, there is no thrust in the case without a cover. Accordingly, the air randomly enters and exits through all available slots, and the bulk of the air mass simply circulates inside.

Focus with numbers
Those who like to remove the side cover on a PC will reasonably argue: “With the board open, the temperature on the video card drops by 7-14 degrees.”

Indeed, elements of a PC with active cooling with this scheme drive away warm air from themselves and become colder by several degrees, but all other elements of a computer with passive cooling heat up by the same amount. Since there is no supply of cold air in the required volume, the temperature inside the case increases all the time.

It is strongly not recommended to open the side cover for those who have no active cooling on their video card or only one fan.

Advantages and disadvantages of perforation
Unlike an open lid, perforations help create traction. When the blower fan draws in air faster than the front coolers have time to pump it, a low pressure zone is created and the suction effect appears – the air masses move faster.

A high pressure zone occurs when air is forced into the enclosure faster than it can escape. As a result, the heat cannot be quickly dissipated from the hot processor and video card.

You can read about the correct installation of fans and other cooling systems in this article, and you should also not forget about one of the most popular mistakes when choosing a case.

How top perforation worksAs practice shows, the most effective heat removal scheme is upward from the case. It is logical to put two blowing fans under the cover in order to accelerate heat dissipation.

If put on the blower, warm air from the video card and processor will mix with the cold air flow under the cover. In the second case, warm air will not go up, but will remain circulating inside the PC.


Simulation of all options in dynamics:

With a blank cover, air will rush up and back, if you put a 140 mm fan for blowing out in the Middle and Fulltower and a few 120 mm in front, you can achieve results similar to a perforated cover.


The only drawback of the mesh top cover is the dust settling on it. This problem is easily solved with a magnetic mount filter.

How perforation works on front covers
Air is sucked in from the front through side or front vents. In some models, there is an air intake slot between the glass and the body.

Side perforations create more traction than slots on both sides, which contribute to the formation of a high pressure zone.

Noise and dust
A deaf case is better at isolating all noise and dust if it does not have a mesh on the side. In closed boxes, dust mainly sinks from below and settles on the filters. Blind-lid models are hotter, but generally quieter and less dusty than their perforated counterparts.

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Therefore, manufacturers often produce the same case model with front glass or perforation. Here the user himself decides what he values ​​more: good cooling or silence.

Pros and cons of different types of enclosures
Pluses of blind covers:

Less dust.
Can be installed in a niche or table.
Cons of blind covers:

Heat dissipation from the processor and video card is worse.Pros of perforated lids:

Better cooling inside the case.
Increase in the efficiency of the processor cooler due to the creation of a low pressure zone.
The video card cools faster.
Cons of perforated lids:

More dust outside and inside.
In addition to the actual pros and cons, there is another important factor to consider – the parking space. If the computer is in a desk, the top perforations and fans will be of no use.


If the PC is on the floor, the bottom fans will suck in all the dirt and dust from the floor. Better to put them higher.


In general, for a gaming computer with a powerful graphics card, it is better to choose a perforated case. If the appearance is not important, the computer will be under the table or in the table, a PC with a blank cover is quite suitable for these tasks. The trade-off between fast cooling, noise and dust can be found in a case with a glass front panel.