An arrangement for a marine vessel, comprising - a combustion unit arranged in an engine room of the marine vessel; - an exhaust gas cleaning system comprising a scrubber , the scrubber being optionally vertically positioned, the exhaust gas cleaning system being in flow connection with the combustion unit and being arranged for receiving and for cleaning the exhaust gas from the combustion unit resulting in a cleaned exhaust gas; - a cleaned gas exhaust pipe being in flow connection with the exhaust gas cleaning system and arranged for receiving the cleaned exhaust gas; - a plume control system , comprising • an air intake for taking in ambient air; • a heater for heating the ambient air producing heated air; and • a gas mixer placed in the cleaned gas exhaust pipe and arranged for mixing the cleaned exhaust gas in the cleaned gas exhaust pipe with the heated air resulting in an exhaust gas mixture that is blown out into the atmosphere via one or more cleaned gas exhaust pipe outlets. wherein the plume control system comprises a fan arrangement placed before the heater and arranged for blowing the ambient air into the heater and for blowing the heated air further towards the gas mixer ; and, wherein the plume control system comprises: - a flexible connection placed after the fan arrangement to reduce the fan vibrations; - a silencer placed between the air intake and the fan arrangement ; - a valve arranged to be closed to bypass the exhaust gas cleaning system in case it is not in use; and/or; - a throttle valve placed in the cleaned gas exhaust pipe between the demister and the gas mixer , the throttle valve having a diameter that is smaller than the diameter of the cleaned gas exhaust pipe . - a combustion unit arranged in an engine room of the marine vessel; - an exhaust gas cleaning system comprising a scrubber , the scrubber being optionally vertically positioned, the exhaust gas cleaning system being in flow connection with the combustion unit and being arranged for receiving and for cleaning the exhaust gas from the combustion unit resulting in a cleaned exhaust gas; - a cleaned gas exhaust pipe being in flow connection with the exhaust gas cleaning system and arranged for receiving the cleaned exhaust gas; - a plume control system , comprising • an air intake for taking in ambient air; • a heater for heating the ambient air producing heated air; and • a gas mixer placed in the cleaned gas exhaust pipe and arranged for mixing the cleaned exhaust gas in the cleaned gas exhaust pipe with the heated air resulting in an exhaust gas mixture that is blown out into the atmosphere via one or more cleaned gas exhaust pipe outlets. • an air intake for taking in ambient air; • a heater for heating the ambient air producing heated air; and • a gas mixer placed in the cleaned gas exhaust pipe and arranged for mixing the cleaned exhaust gas in the cleaned gas exhaust pipe with the heated air resulting in an exhaust gas mixture that is blown out into the atmosphere via one or more cleaned gas exhaust pipe outlets. - a flexible connection placed after the fan arrangement to reduce the fan vibrations; - a silencer placed between the air intake and the fan arrangement ; - a valve arranged to be closed to bypass the exhaust gas cleaning system in case it is not in use; and/or; - a throttle valve placed in the cleaned gas exhaust pipe between the demister and the gas mixer , the throttle valve having a diameter that is smaller than the diameter of the cleaned gas exhaust pipe . <EOS>