PLUSPOE DC 5V USB Brushless Cooling Fan, 40mm x10mm, Dual Ball Bearing Quiet Operation w/Speed 6800 RPM

Using these for a homemade PAPR (positive air pressure respirator) running off a drill battery. Only plan on using with larger, not-flamible dust. Any kind of gas or smaller particle could potentially be dangerous.I know that 18 V is more than they are rated for, so they may not last as long under those conditions. But for the price it is worth trying. Have used for about 20 minutes working on insulation in the attic. So far so good.I initially planned on regulating down to 12V using a motor speed controller that I pulled out of a power wheels conversion that I had done. But the fans just squealed until full voltage was applied. The controller is using PWM and these brushless motors don't seem to like like that. At first I wondered if there controller was bad, but I tested on a motor out of a drill, and it worked fine.Also tried putting both motors in series to reduce the voltage applied across each. This works with brushed motors, but apparently not with these brushless. I didn't pay attention to the fact these are brushless when ordering, so I didn't think about it before trying. Was going to use a double pole double throw switch to change between series / parallel for high / low speed. But that won't work, so I'll try the 18V until they burn up or get a 12V battery pack. It will be worth it if it makes breathing in the attic easier for a few hours.Obviously, I'm putting them through much more strenuous conditions than intended, but they are still working. So that seems to speak well to the quality and durability. I'll update if they do ever stop working.

I bought these fans to replace a fan that had failed in my gigabit ethernet switch. When I opened the box that the switch was in, I was surprised how simple the configuration was. There was a circuit board in the middle, a power supply toward the top, and a fan on the right hand side, pulling air across the heatsinks of the circuit board.Since the fan had failed, I wanted to replace it as quickly as possible. I ordered this fan kit from Amazon.This fan kit came with two 40 mm x 10 mm fans. Each fan has nine blades versus the original fan which only had seven blades. As far as the fan speed or the CFM of the original fan goes, I can’t really compare since the original fan had failed.I easily replaced the fan on the right hand side since it was just a swap out of the existing fan.However, since I had a second fan in the kit, I wanted to add it in as well. So I ended up taking all of the components out of the metal box, drilling a couple of holes that would fit the new fan, and adding the second fan. The second fan now blows air into the box from the left to assist the fan on the right hand side which was blowing air out of the box.I wired everything up and it all worked perfectly. Now I feel like my switch is getting proper airflow, which hopefully will extend the life of the switch and keep my home network running at top speeds.The fans seem to work perfectly, and I can feel the air flowing out of the box on the right hand side. I did see some comments about how noisy these fans were, but I felt that they were very quiet, especially for the amount of air that they’re actually moving. Overall, I am very pleased.

Needed to splice a longer connector to use it with my 3d printer. Cable is only a few inches long - works great otherwise

The PLUSPOE 2-Pack 40mm x10mm DC 5V USB Brushless Cooling Fan is an excellent choice for those looking for a compact and efficient cooling solution for their computer or other electronic devices.The fan comes in a pack of two, making it a great value for money. The size of the fan is just 40mm x 10mm, which makes it ideal for use in small electronic devices where space is a premium. Despite its small size, the fan is powerful enough to provide sufficient cooling to your device.One of the standout features of this fan is its dual ball bearing, which ensures a longer lifespan and smoother operation. This feature is particularly important for those who plan to use the fan for extended periods, as it reduces the wear and tear on the fan and helps to prevent noise and vibration.Another great feature of the PLUSPOE 2-Pack 40mm x10mm DC 5V USB Brushless Cooling Fan is its quiet operation. The fan produces a low noise level of just 25 decibels, which is almost whisper-quiet. This makes it ideal for use in environments where noise levels need to be kept to a minimum, such as in a bedroom or study.Overall, the PLUSPOE 2-Pack 40mm x10mm DC 5V USB Brushless Cooling Fan is an excellent choice for anyone looking for a compact and efficient cooling solution for their electronic devices. With its dual ball bearing, quiet operation, and small size, this fan is a great value for money and is sure to keep your devices cool for years to come.

in tight spaces this would be good, but the fans are NOISY. which is to be expected per their size

Small & quiet

I replaced the internal fan on my beeping APC UPS. This solved the problem.

Moves air and very quite. Just what I wanted.

Great price very quiet I only wish they would offer a mother board connection version because that is why I bought it in the first place, but it still worked great.

Didnt really read on how small these actually are. They are small. Lol

The items appear fine but I'm deducting points because the package was already opened (see attached image).

A little tinier than expected

Bought them to cool a modem both fans don’t Have the CFM to do the job