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Since 1924, the Daiken name has stood for innovation. Daiken co-developed the ozone-friendly R410A refrigerant along with Fujitsu. Daiken also invented variable refrigerant flow (VRF) or variable refrigerant volume (VRV) for commercial air conditioning.
Variable refrigerant flow (VRF), also known as variable refrigerant volume (VRV), is an HVAC technology invented in 1982. Like ductless minisplits, VRFs use refrigerant as the cooling and heating medium. This refrigerant is conditioned by a single outdoor condensing unit, and is circulated within the building to multiple indoor units.
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