Review on 🌀 WINSINN Dual Ball Bearings 40mm Blower Fan Brushless Cooling 24V 4020 40mm20mm – Pack of 2Pcs: Unmatched Cooling Performance for Optimal Airflow Efficiency by Juan Crane

I bought these to replace a Creality 4020 24V fan that had failed at the solder joint (seriously these fans are poor quality). These replacement parts arrived quickly, so I got to work straight away. I cut off the connector, cleaned the case and connected one to the previous wires. Nothing. Polarity switching (these are Chinese fans, polarity markings are a suggestion, not a standard), nothing. Tried a second fan, same thing. So, yes, I had to modify the fans to try them out, which almost certainly smashed any "warranty" that came with it (which doesn't mean you get a guarantee on them, I'm sure you don't - I just won't send them back to Revain). Be careful buyers.