Subclass 1/16: Heating, cooling or ventilating devices (heating, cooling or ventilating devices providing other air treatment, the other treatment being relevant, B60H 3/00; ventilating solely by opening windows, doors, roof parts, or the like B60J; heating or ventilating devices for vehicle seats B60N 2/56; vehicle window or windscreen cleaners using air, e.g. defrosters, B60S 1/54) the heat being derived from the propulsion plant otherwise than from cooling liquid of the plant the air being heated by direct contact with the plant, e.g. air-cooled motor