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DC fans with 4 poles are available in two variants: one has a sleeve bearing system (EE_), while the other features a vapo bearing system (MF_/HA_). Both types have impellers and frames made of thermoplastic that complies with UL94V-0 standard. These fans connect through stranded wires, and utilize magnetic levitation technology. Their dimensions measure 40x40x20mm, and they operate at a rated voltage of 12V DC.