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Winsinn 40Mm Blower Fan 24V, 3D Printer Micro 24 Volt Fans Blower 4020 Hydraulic Bearing, 40Mmx20Mm 2Pin (Pack Of 4Pcs)?Oil bearings - High Speed version?Oil bearings, use time no more than 16 hours / day. The life expectancy is about 30,000 hours. Lubricating oil is required to maintain the bearing.?Size: 40x40x20mm?Rated voltage: DC 24V ?Line len..