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80 x 80 x 25mm (3.15 x 3.15 x 0.98in). Ball bearings, reinforced thermoplastic PBT impeller, class UL94V-0. 24V and 48 V, 26 CFM to 54 CFM. UL, cUL, CE listed. Auto Start with Locked Rotor Protection. RoHS compliant. Optional Features:Tachometer, Rotation Detector, Life Detection, Over Voltage Protection, PWM, Current Limit Control, Constant Speed