There are two variations of this LG Ductable Inverter AC available: Inverter High Static Duct in 5.5 TR, 8.5 TR, and 11 TR, and Inverter Low Static Duct in 1.5 TR and 2 TR. LG Ductable Air Conditioners offer eco-friendly refrigerants, silent operation, energy-efficient inverter technology, and a stylish design for comfortable and ideal air distribution. Both versions have long-distance piping, a minimum height, easy maintenance, and a robust black fin finish that resists corrosion.