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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.
A Concentric Systems is comprised of many components. Instead of explaining the components in their assembled order, I'll jump to the Hard or Flex Type connections. They dictate the construction of all the parts that make up a concentric diffuser system. Hard & Flex Duct Connections -- Two primary concentric diffuser systems dominate the market. They are referred to as Hard, or Flexible Duct systems.