AC InfinityMULTIFAN Mini, Compact 40mm x 20mm USB Fan, UL-Certified for VR Gear, Aquarium, Roku, Router, Raspberry Pi, Cosplay, Helmet Cooling Ventilation

Quiet little fan, but good airflow at variable speed, reduces heat brilliantly and just powered from USB. Seems to do what I wanted perfectly

This small 40mm fan is used to keep a previously hot AC1900 WiFi dongle cool. It is clamped on to, and behind the dongle with cable ties. Blowing cooling air through the WiFi device, it cools effectively. It is mounted on the wall and with the fan running at its lowest speed, cannot be heard. A small white grill is mounted just in front of the assembly, so it doesn't look unsightly.

Very loud even on low settings, got it to cool down my Pi case but it was too loud for me to Handel and turned it off.even on low settings it's still loud , USB cable is way longer than what i had in mind and I was bothered by it as i was looking for a small foot print setup.over all its a powerful fan but doesn't work with what i had in mind for it

More noise than the larger units - but still a powerful fan.

Nice little fan, but describing it as "ultra-quiet" ??? It makes a noise like a mosquito in your ear. The decibel level is not the only measure - a high pitched noise is much harder to taken than a lower note, even if technically it's the same dec ibels. . It also doesn't seem to push much air despite the stats.

The fans work perfectly, are good quality, and are silent. Some of the negative reviews indicate that these fan do not move much air. While that may be true compared to other similar fans, these usb fans are not intended to have a high CFM (cubic feet per minute-it is a measure of air flow volume) and their intended purpose is not high velocity. High CFM fans are loud and are not low voltage usb. However, the 2 fans together allow for increased cooling without noise. There are other products if you need high velocity. If you purchase the wrong tool for the job, it’s not the manufacturer’s fault that it did not work for the intended purpose. Additionally, AC infinity’s customer service is extremely responsive and courteous. They responded to every inquiry, did it quickly, and resolved the issue in my favor. AC Infinity is located in CA.

Let me just say, that over time I have bought 4 of these fans. Why? Because they work really well.I have two external Western Digital My Book hard drives. These hard drives don't have any active cooling (no fans), so any heat generated by hard drives is simply exhausted out the top of the plastic case. When the hard drives were in use, the temperatures of the drives would increase to 50-55 degrees (over 40 degrees at idle), causing the hard drives to be throttled, and lower performance.I put two of these fans on the top of each of the cases (where the heat escapes). I put the fans so they pull the heat out of the case (blowing the air away from the case). With the fans, the hard drives now stay below 40 degrees in use, and around 30 degrees when idle.The only issue (not a major issue) is that the fans are louder than I would have thought. I can hear their whirring sound from the other side of the room. It isn't a loud sound, but it is noticeably. When my computer is on, though, the sound is drowned out by my computer's fans.Overall, the fans are great for keeping my hard drives cool, even when they are in use, which helps keep their performance from being throttled.

Llego en perfecto estado y antes de tiempo, producto hecho de calidad y con buenos materiales.Realmente no esperas que estuviera tan bien hecho el ventilador. Superó mis espectitivas.Es muy pequeño 4 cm aprox. Muy silencioso haata cuando le pones el máximo nivel. Perfecto para ventilar lugares con poco espacio.Lo utilice para un disco HDD qué sé calentaba mucho en mi Ps4.Viene en una caja bien embalado y no escatiman calidad. Lo recomiendo al 100

Ich verwende den Lüfter für einen Versuch. Er soll warme Heizungsluft in einen Kanal drücken und an dessen Ende an einer Wand hochpusten. Mich interessiert, um wie viel °C mehr er die warme Luft in einer kritischen Ecke hinbringt und ob die Wand damit ausgetrocknet werden kann. Sozusagen mit 0,8W schimmellos durch den Winter.Was soll ich sagen?! Es funktioniert. Die Heizungsluft kommt auf Stufe 1 um 6 °C wärmer an und nach drei Tagen ist das nasse Eck an der Decke messbar trockener geworden. Ich bin begeistert von diesem kleinen Lüfter!

薄型が欲しくて買った。狭い場所でも使えるのは良かったが、80mm製品と比較して音が大きく少し残念だった。