OK. That is very common. You can buy the OEM here https://www.digikey.com/product-detail/en/sunon-fans/PF40281B1-000U-S99/259-1751-ND/4840557 ... but at mid web page, you will find equivalents at SanyoDenki and Delta. I suggest fans from SanyoDenki. Double ball bearings. Far better than Chinese crap. Their Web page here: https://products.sanyodenki.com/en/sanace/ Fan selector page is here: https://products.sanyodenki.com/en/sanace/search/ This one: https://www.digikey.com/products/en?keywords=9WL0412P3J001 has a little less air flow, but at 150,000 hours, it is almost tripple the life. And all-aluminum frame construction 7 db quieter, PWM. Easy. Good luck Paul Jr
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