Amazon.com: Supermicro Cooling Fan - 1 x 80 mm - 11000 rpm - Center Fan Location - FAN-0130L4 : Electronics
VEVOR Industrial Ventilation Extractor Metal Axial Exhaust Commercial 14 inch Air Blower Fan 300MM Opening Exhaust Fan 2800 RPM Low Noise Stable Running - Walmart.com
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Supermicro FAN-0143L4 80x90x38 mm 11,000 RPM Fan for FatTwin GPU (Rear) Case Fans - Newegg.com
Amazon.com: Supermicro Cooling Fan - 1 x 80 mm - 11000 rpm - Center Fan Location - FAN-0130L4 : Electronics