VENTILATION DUCT UNIT

The object of this invention is a ventilation duct unit (1), which comprises an inlet (2), an outlet (3), a flow channel (4), which extends from the inlet to the outlet, and which is delimited by a wall (5) between the inlet and the outlet, a closing part (6), which is arranged into the flow channel, and which in open position enables flow in the flow channel, and in closed position prevents flow in the flow channel, closing member (12), which as a response to detecting fire, sets the closing part (6) to a predetermined position, and an actuator (8), which moves the closing part (6) between open and closed state in order to achieve flow defined for the actuator (8) in the flow channel. In order to utilize the ventilation duct unit for controlling fire situations and sound dampening, the ventilation duct unit further comprises insulation material (14), part of which is fireproof, and which surrounds the wall (5) of the flow channel and isolates the surrounded part of the wall of the flow channel from its surroundings, and holes (18) arranged in the surrounded part of the wall of the flow channel (4), which dampen sound by leading the medium flowing in the flow channel to be in contact with insulation material (14).