VRF stands for Variable Refrigerant Flow. It is a type of direct expansion (DX) multi-split air conditioning system that incorporates a variable-capacity compressor with a network of multiple indoor fan coil units. A VRF system increases energy efficiency by providing cooling or heating only to the zone(s) or room(s) where air conditioning is needed. Most VRF systems employ an individual control and communication network.

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AIRSTAGE is a trademark of Fujitsu General Limited.