Wathai High Airflow Router Cooling Fan for Computer Cooler TV Small Box DC 5V USB Power 120mm 240mm Fan with Multi Speed Controller

I liked that when I placed it on top of my T-Mobile/Nokia 5G Home Internet Gateway it brought it from hot to touch under idle use to cool even under load. I used a USB-A to USB-C adapter to power the fan using the modem itself. The modem has not crashed since I installed it on top. I chose to place it on top because the feet prevent it from sliding off and the cool air is pulled from the open bottom.

I put the T-Mobile Home Internet 'Trash Can' (Modem) on top of this fan and my speeds during the day doubled. I noticed the SNR went down during the day and this fan kept the temperature down and the SNR got better.

I get that it wasn't the intended purpose for this, but I've been having a massive heat issue in my bedroom thanks to a mix of my PC and lack of air circulation in/out of the room with the door closed. So, when I saw this, I thought I'd give it a chance. As you can see by the picture, I plugged it into a wall charger and placed it on the floor vent to my bedroom (after removing the lifted feet), and I have to say, the difference is astounding. I'm no longer having to worry about sweating in my bedroom, and the solution was very cost-effective.

Mine sits under our Cox router/modem. Apparently those Cox units are famous for getting really hot. We returned the first modem, overheating at near 200F. The replacement reaches 140F. So they're hot, it seems, no matter what. So I set this fan on some simple spacers to raise it off the table by an inch, then set the modem on top of the fan. Cool (room temp) fan air now blows up and around the modem. Temps are lower by about 8 degrees. More importantly no more thermal shut offs. The fan is about six feet from my head. At three in the morning, if the whole house is shut down, no traffic/airplanes/fire trucks outside, I can just barely hear it. It's quiet. Been running 24/7 for weeks now with no problems, no increase in noise.

I'll start with the bad, because no matter what when this fan goes I won't be buying this as a replacement, even if it lasts me for years. Unless it starts going for about $10 because that's the max I'd pay for another one.The "removable" feet. Poorly made. The whole foot setup is just a jerry-rigged setup of a long screw, a hollow piece of rubber, a nut, and a circle of adhesive foam. It's a really long screw that goes through a hollow rubber foot. The way it screws in is with a small nut. That nut is only held in place by a basic adhesive that also holds the foam pad to the bottom of the rubber foot. If that nut detaches from the foam (and it will) then it's basically impossible to put the foot back on properly because nothing will hold the nut in place to stop it from spinning when turning the screw.Once the foot is detached you realize that the screw setup was also being used to hold together the plastic guard/framework holding the whole thing together. So now you have four loose/floppy corners, but it's still held together, mostly, because there are four screws inbetween the 2 fans that ultimately keep the plastic anchored. And you can't just reuse the screws with the nut to tighten the corners down because the screws stick out as far as the feet did (because of how they originally had to screw into the nut, reaching to the far end of the feet) so even just using the nut to secure the screw and clamp down the plastic, the fans will still be elevated on the ends of the screws which defeats the purpose of even taking the feet off in the first place.---------------------------As for the good... so far it's otherwise about what you'd expect for this price. The fans work. The noise is there but not egregious. If you have anything else making noise or you use headphones a lot you won't notice the sound. As for how long this will last... I only just got it today and tested it, but given the "craftmanship" of the rest of the product I have my doubts as to how durable the fans will be in the long run.I bought this for a dual purpose. My parents like to keep the house warmer than I'd like, in general, and my bedroom being on the 2nd floor and having a gaming PC and 2 TVs and me preferring to have my door shut my room can get quite warm in the summer. So on days when they feel it's cool enough to have the windows open I wanted something I could put in the window to help circulate air in/out faster, and on days when they'll turn the air on I could put it over the floor vent for when the house fans weren't currently running between cooling cycles to keep pulling up cooler air from the basement.Ultimately... once it's set up it seems to work for it's intended purpose, and that's the only reason I'm going neutral on the overall rating with a 3/5. But I probably could've just rigged something up myself with old PC fans for much less but I was hoping I'd be getting a more solid setup by buying this.