The invention relates to a device and a method for cleaning a gas in a confined environment, said device comprising a cleaning room with an inlet for the gas to be cleaned, an inlet for a reactant gas for combustion in said cleaning room and an ignition device for combusting said reaction gas, and an outlet for the mixture of cleaned gas and combustion products from the cleaning space. The reactant gas comprises a substantially stoichiometric mixture of H2 and O2.The inlet for the gas to be cleaned may be in contact with the residence environment and the cleaning room, and the outlet for the mixture of cleaned gas and combustion products may be in contact with the cleaning room and the residence environment. The device also comprises a radiation element that is in radiating contact with the residence environment, wherein the radiation element is in heat-exchanging contact with at least one of [a] the combustion flame of the reactant gas and [b] the mixture of cleaned gas and combustion products from the cleaning space.The method and device may be used for cleaning exhaust gases of a vehicle.
