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A typical computer case is considered as a closed-air design, where the components and the GPUs are enclosed within a case, box or container. In a closed-air design, the only openings are designated air channels for the entrance and exit of ventilating air. The air channels usually have fan-mounting holes to which cooling fans can be fitted.

In the past, I managed to fit four maximum GPUs in a mining rig with a giant full- tower case. Two of the GPUs were installed on PCIE X16 slots and two were connected by USB3 PCIE-riser cards. The reason for doing this was only in order to control the noise with a closed enclosure and also to eliminate the dust.

The advantages of a closed-air design over an open-air design are:

1. Better control of dust—the dust filters can be placed on the air intake and trap the dust properly.

2. Better noise suppression and much more suitable for non-industrial environments, such as a house or school, or when there is only one or a few GPU miners working.

3. Better control on air delivery and air exhaustion. Yes, better control, but less air delivery due to restrictions.

The disadvantages of a closed-air mining rig:

Figure 5 - Corsair 100R mid-tower case from 3 different views. This is a perfect case for a mining rig with maximum of 2 GPUs, link is here!

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1. More complex design and usually more expensive than an open-air system.

2. Less air delivery as the GPUs are entrapped in a tighter space, have less room to “breathe” freely, and the walls of the case make it more restricted.

3. If the external fans fail, the GPU miner runs very poorly as the GPUs’ core temperature rises very rapidly and would shut down or the core clock would throttle down (this reduces the performance).

4. Not suitable for industrial use or a large mining farm. In a mining farm, the noise of the GPU miner doesn’t matter, and as mining farm produces lots heat, there is well-designed ventilation system in charge of delivery of fresh air and exhausting of warm air. A ventilation system also can also be used to manage the air filtration using some industrialized air filters. A closed-air chassis uses its own simple air filtration system just before the intake fans.

Let’s get back to the closed-air design. How do we make one? What you need in order to build a closed-air mining rig are the following:

1. A big box made out of wood or metal. A metallic box would however be hard to reshape, cut or make holes in.

2. The components of a mining rig. 3. Fans and air filters.

Usually, I made my closed-air mining rigs out of used cabinets, shelves, boxes, commodes, etc. The best option on these is a small two-section cabinet made of wood with a door. Below picture shows a TV table with wheel, which is ideal to place motherboard and GPUs on different shelves.

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wooden shelf is my favorite to use because:

1. It is easy to get for free or very cheaply. In any neighborhood, you may find old and unwanted furniture for free, or buy them cheaply. There is no need to worry about the appearance—the look isn’t important at all, so, a scratched, old and tarnished one would be just fine.

2. You can modify the body easily, drill holes in it, take parts off or add an extra shelf.

3. Wood is an electrical, sound and heat insulator, so the GPUs and PCIE risers can be directly screwed to it. Wood also damps some of the noise.

At the professional level, there are companies that design and build server racks

or professional computers for graphical or mining purposes.

Figure 6 - This is an old wooden cabinet with door. It has enough space for a miner with three to four GPUs. By adding another shelf, it could take a total of 6 GPUs in two stories.

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As I said earlier, the main goal of a closed-air design is to control dust and noise and without these two main advantages, this design has poorer characteristics in performance than open-air design.

Figure 8 - This is a neat design called "GrayMatter GPU Server Case V2.1" from miningrigs.net. It can accommodate 6 GPUs, but does not have the air-intake filtration, link is here!

Figure 7 - This is a picture of a server computer with 8 Nvidia Quadro GPUs. It is not suitable as a GPU-miner as the GPUs would be too close to each other and would not allow enough fresh air to circulate. In addition, blower-style GPUs are not suitable for mining purposes as they have inferior cooling abilities. Link is here! And here!

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The advantage of a custom-made mining rig is that you can customize the cooling fans too, or you can buy an empty well-made mining chassis and add your own components. Most mining-rig chassis don’t come with an active air filter which is very important for me. Also, server-grade cooling fans rotate at high speed and are very noisy.

To complete a closed-air mining rig, you may need to cut, drill or modify your custom-made mining-rig case, which could require some expertise and could be time consuming.

Figure 9 - This is a 6-GPU MINING-RIG CASE WITH 3 FANS from cryptomined.com. It has a big open mesh (grill) for exhaust. Link is here!

Ai r f low d ire ct ion

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Here is a custom-made mining rig with 8 GPUs and two motherboards which I built inside of an IKEA shelf. The backplate of the shelf is not original; I made that out of thin plywood as the original backplate was too thick to cut and drill in order to make holes for all of the fans. Most of the fans are F12 Arctic PWM, but one is a 150-mm low-noise 220-V fan, which is at the bottom.

Wireless

router 150 mm intake

fan 220 V

12v Fan controller 4Channel Back view, fans and

insolation material F12 intake fans

F12 exhaust fans

F12 exhaust fans Power and reset

button _{Front door covered with}

insulation foam

Power distributor

Power and reset button

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Front door covered with insulation foam

Four section hardware design

Mobo, PSU and one GPU Mobo, PSU and one GPU

Three GPUs and SSD Three GPUs and HDD

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Fourth level, a closer look

First level, a closer look Second level, a closer look

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