Variable Frequency Drive (VFD), Used with Demand Control Ventilation and Smart Control Electrical Panels. AC Tech Model # ESV751N02YXB571 Rated for 1 HP Max., 200/240 V, Single or Three Phase Input, 4.2 A Max. NEMA 1 Enclosure, with 2RJ-45 FOR MODBUS. VFD shipped with manufacturer default settings. Application specific parameter setup is required