In a system for gas cleaning which has at least one casing (1) with a first chamber (31) into which the gas to be cleaned can be flowed, and with a second chamber (33) from which the cleaned gas exits, wherein a filter device (35) which can be flowed through by the gas is arranged between the chambers mentioned and has filter media both for the separation of solid particles and for dehumidifying the gas by separating out coalesced liquid, the system has, upstream of the filter device (35), an arrangement (11, 37) for preliminary dehumidification of the gas.