Wathai High Performance 97mm x 33mm USB Blower Fan with Speed Control for Cooling PC Computer Case, AV Cabinets, Entertainment Centers

Works great. Threw it on a 3d printed bracket and mounted to an external gpu. Keeps the temps nice and low.

Moves a lot of air for their size. Quite on low setting. Loud on med-high. Grate for keeping amps or electrics cool for best longevity and proformace!

Using these to cool down my receiver- works really well and has a lot of air being pushed even at its lowest setting, but it is a bit louder than I would like.

Used to cool sfp in a cabinet. Unit had been running on med speed for over 1.5 years. Still going strong.

Great for cosplay, I needed something for my nephews cosplay helmet to help cool him down and this works perfectly. Just buy a 5v rechargeable battery pack to power it and you're good. Helps cool you down, not too loud. And the size fit perfectly in his helmet. Just be aware this is a bigger size, so just make sure it will fit before purchasing.

I had a problem with heat when I mounted my router vertically. I made a plenum out of 1" square stock and glued foam to it as shown. I hot glued the fans to the backing board. I then mounted my router, set the fan power to mid range and heat problem solved. That worked so well I also bought another set of fans to cool my modem. Again, hot-glue was used to mount the fans as well as to provide sealing the area around the base of the modem. Very Effective.

The fans arrived broken. The wire strain protection is very flimsy, a couple tiny tabs that the wires weren't even held by (unclear whether they were never tucked under, or the tabs are ineffective at holding the wire), resulting in the wires being torn off and the fans unusable without a repair with a fine tipped soldering iron. The two-fan speed controller looks good, but it's no use if the fans are DOA.

They have a noise but it's a soothing noise, like air. I wouldn't complain about it and they're nice and slim.