Airside terminal devices are used to regulate the temperature and volume of air to different rooms and areas of a building. Office buildings, for example, will have many zones with different heating and cooling needs, depending on the number of occupants, whether or not the room is in use (i.e. a vacant conference room) and proximity to outside walls and windows. Terminal devices are placed in these zones, each with its own thermostat to regulate the temperature and volume of the air based the current needs of that space. EC motors are very useful with terminal devices as they are easily able to adjust the airflow volume using the built-in capabilities of the EC technology.