[EN 16798-1:2019, 3.23]:system installed and used to keep comfortable conditions in a room within a defined range.Note 1 to entry: Air conditioning, chilled beams and radiant, surface heating and cooling systems are included.[EN 16798-3:2017, 3.2]:combination of appliances designed to keep comfort conditions in a room within a defined range.Note 1 to entry: Air conditioning systems as well as surface-based systems, such as embedded systems, chilled ceilings and chilled beams, are included.