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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.
Simply put, a duct is the channel that carries cooled air from the air conditioning unit through your home, and can also remove warm or stale air. Ducts for central air conditioning can also be used for heating and filtering systems. Letâs look at some of the different types of ducts needed for air conditioning. Flexible Ductwork. Flexible ducts are typically tube-shaped, made of a wire coil covered with a bendable, durable plastic, and surrounded by insulation.