The invention is related to a device in a paper machine for collecting the mist that is produced in the spraying of high-pressure water employed in the washing of a wire. The device includes an inlet duct extending across the wire width. The central axis of the device is at an oblique angle in relation to the direction of running of the wire. The device includes a jet guide in connection with an inlet opening of the inlet duct. The jet guide is connected to the frame by means of adjusting members and operates as an air closure and as a regulator of suction capacity. The position of the jet guide can be adjusted relative the surface plane of the wire by means of the adjusting member.