DB04028B12U 40mm Fan 4cm 4028 40x40x28mm 12V 0.66A Dual Ball Bearing 4-Wire 4pin PWM Server Power Airflow Coo

Excellent fan very very powerful. Very high airflow. I run this on a 4S Lipo to cool off my RC motors.

I purchased this fan as a replacement for the one which came with ICY DOCK ToughArmor HDD enclosure. When it comes to airflow, this little guy is an absolute beast. I was controlling it via motherboard and even though it was being run at 5V (motherboard limit), I saw speeds exceeding 13000 RPM so you can imagine the speed at full rated voltage of 12V. Now for the sad part: Even at low speed < 3000 RPM, you can't be in the same room as its distractingly loud (can't even watch a movie). When its running at full speed, its like a jet engine. I had no choice but to return it. My final verdict: As long as noise is not a concern or its installed in a secluded area at home or office, this is a great fan for the price. It will do a great job in removing heat. I can't comment on the reliability and operating - life of this fan especially when it operates at such a high RPM. High RPM does take a toll on the bearing unless they are specifically designed for it.

Moves a ton of air but its very noisy and the blades on the intake side have pointed edges that really "bite" if you accidentally touch it while running. Be very careful while its running.

Works great and puts out a very nice amount of air. I use this fan to cool the esc on my 6s 1/7 arrma Mojave and it has taken the temps down from 140f+ on a 70f day to no more than 114f. I no longer have to let the esc cool down it has yet to even reach 120f with this fan. The only downsides are you have to find a way to connect it to a power source and the volume is loud. I chose pwm to usb with 5v step up in line and a 10000mah power bank this works wonders and allows me to keep the fan at whatever speed i want. In terms of volume it doesn't bother me its on a car that makes much more noise than the fan when its moving but if you're planning on using it for a server or anything indoors make sure you need this much air and/or don't care about loud fans.

These things move a TON of air around and are LOUD even at slowest RPM. I mean it’s like a leaf blower in a server chassis haha! They work super well for air movement and seem well made. Time will tell with that. If you want quiet move on these are not for you. But you just need some serious air flow? Buy this fan. It blows.

Got these to finish my ratrig vcore 4.0 projects as the factory recommended fan was rated at 25000 rim at 24v I found it way to loud and unnecessary for the speeds I'm running. This one runs at 15000 rom which is drastically more tolerable than the ones from ratrig. The balance seems good on them and I don't hear much for harmonics. Definitely recomend for normal print speed applications

The product sent me was pre used would like a new one sent.

Good fan that worked well for my 1u install, lots of power and airflow.

These fans work really well !!! they move a ton of air. I put 2 of these on a Tesla P40 and they keep it really cool... of course, they are noisy, but cool = noisy. If your looking for something to move air, choose these ! really impressed

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