Supply air terminal device comprising an air flow regulator

The invention concerns a supply air terminal device 10 and a method for regulating the airflow rate. The supply air terminal device comprises a heat exchanger 11, with which a circulated airflow L2 conducted from a room 'H' can be either cooled or heated. The supply air terminal device comprises a mixing chamber 12, into which mixing chamber the nozzles 16a1, 16a2 or a flow gap (16, fig.2C) of an air chamber 15 open to conduct a primary airflow L1 into the mixing chamber, whereby the primary airflow from the nozzles or through the flow gap as a flow (Qs) will induce a circulated airflow from the room to flow through the heat exchanger and into the mixing chamber. The combined airflow (L1 + L2) is then conducted into the room. The supply air terminal device comprises a regulator 100 bypassing the nozzles or the flow gap to regulate an airflow Q3 flowing through the regulator, with which, depending on the purpose of use of the room, it is possible to regulate the total airflow ( S Q) of the fresh primary air (Q3 + Qs) supplied from outside the supply air terminal device. The bypassing flow taking place through the regulator can be regulated progressively. Preferably, the regulator is remotely operated and electrically controlled, where the regulator comprises an actuator (200, fig.6) for moving a closing part 102, such as a valve disc, and for regulating the airflow rate.