The 6 Ton Basic ECU provides an efficient 72,000 BTUs (21.1 kW) of cooling using ozone-friendly R4O7C refrigerant. This skid-based unit is equipped with 16" (40.6 cm) supply and return air ducts and a five-position selector switch. Modes of operation include ON-VENT-COOL-HEAT-AUTO. These units are also available with a turf cart.