Abstract: The present invention relates to a ventilation device (1) comprising a first air duct (2) for air supply and a second air duct (3) for air supply. The first air duct (2) comprises a first outlet (4) for air flow and the second air duct (3) comprises a second outlet (5) for air flow, where the first outlet (4) is arranged to admit passage for a predefined amount of air per time unit (F-i). The second outlet (5) comprises a controllable choke device (6) that is arranged to either take a first position that admits passage for a predefined amount of air per time unit (F3) or a second position that does not admit passage of air. The ventilation device (1) comprises a control unit (7) and at least one detector (8, 9), where the control unit (7) is arranged to control the controllable choke device (6) in dependence of input data from said detector (8, 9) such that demand controlled ventilation is obtained.

Abstract: The invention relates to an induction unit for uniting air flows, comprising at least one induction duct (21) coordinated with a primary air duct (30) and having an upstream end and a downstream end and a straight reference line (A) passing through the ends, and at least one first opening (28) for a primary air flow (F1), connected to the primary air duct (30) and opening with concurrent flow into the induction duct (21). The induction duct (21) has a secondary air intake (22) for the intake of a secondary air flow (F2) from a space surrounding the induction unit and an outlet (24) designed to return an air flow (F3) resulting from the primary air flow and the secondary air flow to the space surrounding the induction unit. The secondary air intake (22) is arranged at the upstream end of the induction duct (21) and is directed substantially parallel to the center line (A) thereof.