12V/24V DC Cooling Fan, 40mm x 40mm x 10mm | ATO.com
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Amazon.com: SoundOriginal 2pcs Brushless DC Cooling Fan 24V 0.06A 40mm x 40mm x10mm Speed 6800 RPM Fans for 3D Printer Humidifier Aromatherapy and Other Small Appliances Series Repair Replacement (Black 24V) :
Fan - 40mm Axial Brushless 24V DC - 1500mm Cable - GDSTime High Quality (Double Ball Bearing)
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Supermicro 40mm Axial 13,000 RPM Fan (FAN-0065L4)
40mm (40x40x20) Medium Speed Ball Bearing Fan - Coolerguys