The novel cylindrical induction VAV controller, as shown in Fig. 1, consists of standard cylindrical ventilation elements such as: inlet, IRIS damper and outlet. The outlet diameter may be the same as the inlet diameter or it may be one size larger. The circular orifice of the IRIS damper forms the axisymmetric air jet which is discharged into the outlet element. The jet induces plenum air through the open space between the two parts of the controller. The IRIS damper is adjusted by an electric actuator which receives a signal from the control system. The invented controller construction is simple and compact, the controller can be easily connected to ventilation cylindrical ducts. Such the construction minimizes the local pressure losses at the inlet and outlet of the controller.