Refrigeration appliance comprising: an outer casing; at least one refrigeration compartment housed inside said outer casing and having a number of sections (6, 7) for housing food at a predetermined refrigeration temperature (t C); a cooling unit for emitting into the refrigeration compartment a stream of low-temperature air having a predetermined flow and temperature; a system for fast localized cooling of food comprising choke means, which choke the air stream emitted by said cooling unit so as to regulate, on command, between a first and second predetermined flow value, the air flow to a specific fast-cooling section in said refrigeration compartment; said first flow value maintaining the temperature inside said fast-cooling section at a value substantially equal to said refrigeration temperature (t C) of the food; said second flow value being greater than said first flow value, and lowering the temperature inside said fast-cooling section to a predetermined cooling temperature (t R) below said refrigeration temperature (t C), said choke means comprising a baffle which rotates, about a given axis of rotation, between a rest position, in which it chokes the air stream from said cooling unit so that the air flow to said fast-cooling section equals said first value; and a fast-cooling position, in which the baffle chokes the air stream from said cooling unit so that the air flow to said fast-cooling section equals said second value characterized in that said system is provided with an actuating unit comprising a control device configured for allowing a user to control said baffle for activating/deactivating the fast cooling of said fast-cooling section, said actuating unit comprising an electric drive unit, appropriately connected by its output shaft to baffle to rotate said baffle between said rest position and said fast-cooling position, and an electric control circuit which receives user commands entered on said control device, and accordingly controls said electric drive unit. an outer casing; at least one refrigeration compartment housed inside said outer casing and having a number of sections (6, 7) for housing food at a predetermined refrigeration temperature (t C); a cooling unit for emitting into the refrigeration compartment a stream of low-temperature air having a predetermined flow and temperature; a system for fast localized cooling of food comprising choke means, which choke the air stream emitted by said cooling unit so as to regulate, on command, between a first and second predetermined flow value, the air flow to a specific fast-cooling section in said refrigeration compartment; said first flow value maintaining the temperature inside said fast-cooling section at a value substantially equal to said refrigeration temperature (t C) of the food; said second flow value being greater than said first flow value, and lowering the temperature inside said fast-cooling section to a predetermined cooling temperature (t R) below said refrigeration temperature (t C), said choke means comprising a baffle which rotates, about a given axis of rotation, between a rest position, in which it chokes the air stream from said cooling unit so that the air flow to said fast-cooling section equals said first value; and a fast-cooling position, in which the baffle chokes the air stream from said cooling unit so that the air flow to said fast-cooling section equals said second value characterized in that said system is provided with an actuating unit comprising a control device configured for allowing a user to control said baffle for activating/deactivating the fast cooling of said fast-cooling section, said actuating unit comprising an electric drive unit, appropriately connected by its output shaft to baffle to rotate said baffle between said rest position and said fast-cooling position, and an electric control circuit which receives user commands entered on said control device, and accordingly controls said electric drive unit.