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Air Handling Unit (AHU) is an integrated multi-device system with various functions to regulate the air conditioning system that can control temperature, humidity, air pressure, cleanliness, air flow patterns, and the amount of air circulation in a room according to specified requirements. AHU usually connect to a ducting ventilation system that distributes the conditioned air through the room and returns it to the AHU.
AHU is usually installed for large rooms capacity such as hotels, malls, offices, industrial building, etc.
Devices of AHU systems usually consist of:
Fan coil unit (FCU) is a simple device consisting of a heating and/or cooling heat exchanger or ‘coil’ and fan. FCU is used to control the temperature in the space where it is installed, or serve multiple spaces. It is controlled either by a manual on/off switch or by a thermostat, which controls the throughput of water to the heat exchanger using a control valve and/or the fan speed.
Due to their simplicity and flexibility, fan coil units can be more economical to install in small capacities with various configurations ceiling mounted or floor mounted.