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40 x 40 x 20mm (1.57 x 1.57 x 0.79in). Ball bearings, reinforced thermoplastic PBT impeller, class UL94V-0. 5 V, 12 V, and 24 V, 5 CFM to 11 CFM. UL, cUL, CE listed. Auto Start with Locked Rotor Protection. RoHS compliant. Optional Features:Tachometer, Rotation Detector, Life Detection, PWM, Current Limit Control, Constant Speed