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I want to make a small air filter using standard axial pc fans in order to suck smoke like that have been produced in soldering process.

But I assume filtering will make it difficult. Am i wrong? The air have to be forced through the granulated carbon filter.

I researched about radial fans which produced spesifically for this job(suction), but they have disadvantages like price, vibration and noise. They are at least 60dba. May not suitable to be used in room.

My main purpose is increasing suction of air, not the air flow. I can go with minor flow. (if my expression is not true please correct)

The question is, can a group of fan in same direction, increase the suction of air? Can it force the air to pass through carbon filter about 1-2cm thickness?

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Alnus
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3 Answers3

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Fans in series will increase the maximum effective pressure. If the filter is of high resistance this will result in an increase in flow for the system. If there is negligible resistance, like if the filter was taken out, one fan will have the same flow rate as 3 fans in series. There is a lot going on here that will be too much to explain in one question. I recommend reading on fan curves, maximum pressure and maximum flow rate if you would like to broaden your understanding.

Zoro.com does a good job of posting engineering specifications for the fans and blowers they sell.

For your product design; solder fans already exist. If you would rather build your own I recommend gleaning some information from their designs like the light weight filter they use or fan dimensions and flow rates.

Soldering fan on amazon, 1
Soldering fan on amazon, 2 solder fan

ericnutsch
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The short answer is yes, but they will be much more effective if they turn it opposite directions, or have straightening vanes between to take the spin out of the air.

Peter R. McMahon
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@Dopeybob435 have gave the answer that I need.

Fans placed in series on a closed system will increase your pressure of the fan curve with little increase in your volume

I understand the static pressure and airflow. I needed pressure so I bought a single radial fan that have 300ps pressure capacity, regarding the noice factor (50db). I still don't know the resistance of granular carbon that amount I am using. But it works just fine, for now.

Thank you all.

Alnus
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