It is 2000 PWM, I have it running a little higher than the 12V its supposed to be at because the power brick is 15 V but it seems to do just fine 
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I have two of these type fans in the 4" ports of my 3x4. One at the top pulling warm air out and one at the bottom blowing cool air in.
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FUCK yeah dude. I had a feeling I wasnt the only one 
, I pulled this guy out my pc too try and increase airflow because I legit have a 5000 rpm fan on my cpu cooler. The original config was this fan u see in the picture + the 5000 rpm in front of that …
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Mine are ac Infinity somethings. I bought them for a space bucket build, but scrapped the idea. They now have a purpose 
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There are some good 3d print adapters for square fans into circle tent ports.
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I just wedged it in there good 
I also cut away the drawstring part as close to the hole as I could. Figure it was in the way lmao
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duct tape is your friend. the real duct tape which is foil, but you have to be more careful with it. it sticks to itself and messes up real bad.
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I have a little one rigged as a circulation fan but I tend not to use it.
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Always use them in my small spaces (the only spaces I have/had ), don’t need more, they’re cheap and can be really quiet.
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Something to watch out for is that string getting caught in the fan and possibly starting a fire…ask me how I know
D
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