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A Fan Coil Unit (FCU) is a simple device consisting of a heating and/or cooling heat exchanger or 'coil' and fan. It is part of an HVAC system found in residential, commercial, and industrial buildings. A fan coil unit is a diverse device sometimes using ductwork, and is used to control the temperature in the space where it is installed, or serve multiple spaces.
The fan works in conjunction with metallic devices called heat sink. These devices enhance the cooling process by pulling the hot air into its aluminum structure. The CPU fan attached to the heat sink pulls the heat away from the heat sink, and pushes in cooler air through the fin-like vents of the heat sink.