Republic 4RC520-H26 two-stage side channel blower with IE3 premium efficiency 3.4 HP, 50/60 Hz, 3-phase, wide-range voltage, TEFC (IP54) motor. Standard features include heavy duty aluminum construction, cool-running outboard bearings for long life, integrated inlet and discharge silencers for quiet operation, 1-1/4" NPT inlet and discharge connections, and a cUL, UL, and CE listed motor with class F insulation.