A system for gas cleaning 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. A filter device (35) can have the gas flow through it and can be arranged between the chambers. The filter device 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.