Highest CFM fan (don't care about noise)

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prettycode

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Mar 5, 2016
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I'm working on a hobby project unrelated to computers but will be using a computer case or CPU fan.

Can someone recommend a fan with a super high CFM? I don't care about noise or size of the fan. Just looking for the most air moved possible.

Found this one at 200 CFM: Ultra Strong 12cm DC12V Cooling fan. 200CFM

Any help much appreciated.

Thanks!
 
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OK, that fan would give lots of air flow. But there are some problems.

1. It's a common computer fan size, 120 mm square (that's about 5 inches) and 1 inch thick. How do you plan to mount it on a plastic bottle that is half that width?

The power requirements are 12VDC at 1.8 amps when running, but up to 3 amps stating current, so it is rated for 36 W. Certainly you can get that from a computer PSU - you'd just need a pinout map of the wires. However, two problems:
(a) that's a pretty big box to come along with your hand-held DIY vacuum; and,
(b) that type of PSU normally will not start up unless certain wires from it are also shorted out (that's a "is mobo present?" test, so you'll have to figure that out, too.

You could rig some...
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Ralston18

Ralston18

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Oct 11, 2014
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Looking at this from another viewpoint: what cfm is needed? At some point, the airflow can increase to the point where it backs up, blocks itself and stalls to loosely phrase it all.

Is 12V DC a requirement as I expect it is? Is there an overall power limit based on some power supply wattage? Even batteries....?

Doubt that you will get 200 cfm from a CPU fan per se. Your selection is a case fan.

Can you install/use multiple fans to increase the airflow?

Generally there are other constraints and criteria. And trade-offs. Can you be a bit more specific about the requirements?



 
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prettycode

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Mar 5, 2016
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Thanks so much for the responses!

My plan is to build a miniature vacuum cleaner, like this one: https://www.youtube.com/watch?v=p5y4OHmjjL4

I bought a DC 12V 2.0A Switching Power Supply Adapter off Amazon for the power source, a small DC motor, and a propeller, but it didn't generate much "suck."

Then it occurred to me that I could probably just use a computer case or CPU fan instead.

Sound feasible? Any suggestions?

I'm not sure how I'd hook up the computer fan to the power supply (case and CPU fans appear to have four wires, not just a positive and negative), but I thought I'd try anyway.
 
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Paperdoc

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Oct 19, 2006
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OK, that fan would give lots of air flow. But there are some problems.

1. It's a common computer fan size, 120 mm square (that's about 5 inches) and 1 inch thick. How do you plan to mount it on a plastic bottle that is half that width?

The power requirements are 12VDC at 1.8 amps when running, but up to 3 amps stating current, so it is rated for 36 W. Certainly you can get that from a computer PSU - you'd just need a pinout map of the wires. However, two problems:
(a) that's a pretty big box to come along with your hand-held DIY vacuum; and,
(b) that type of PSU normally will not start up unless certain wires from it are also shorted out (that's a "is mobo present?" test, so you'll have to figure that out, too.

You could rig some batteries for this, but they would have to be pretty big to run for any decent time, and that may be bigger than a PSU. Batteries certainly cost more to run.

Maybe you need to search out a relatively cheap 12 VDC power supply unit that is smaller than a PSU and easier to use. Try an electronics part shop or maybe an auto parts shop that has small low-power auto battery chargers.
 
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