Ventilated hob comprising a motor-driven fan adapted to provide high pressure air to two or more burners (BRNi) thereof, each of said two or more burners (BRNi) at least comprising: - means (VG, 211; 211.a, 211.b) for supplying and regulating the flow of fuel gas (Q GAS) in input into each of said two or more burners (BRNi) and supplied by a gas channel, said means (VG, 211; 211.a, 211.b) comprising at least one gas injector (211; 211.a, 211.b), - means (VP; 101; UG) for supplying the flow of combustion air (Q AIR) in input into each of said two or more burners (BRNi), said combustion air, supplied from a sealed circuit (CA1, 405, 407), being capable of mixing with said fuel gas, - an electronic unit for controlling said air flow (Q AIR), characterised in that the electronic unit is set so that said air flow (Q AIR) varies as a function of said flow of fuel gas (Q GAS) in input into each of said two or more burners (BRNi) so as to ensure a gas-air mixture with a stoichiometric or substantially stoichiometric ratio without the need of input of secondary air from the outside, said variation of said air flow (Q AIR) being obtained by varying the pressure of the combustion air in said sealed circuit (CA1, 405, 407) inside said hob, said fan being set to regulate its rotation speed to determine the required air pressure, said regulation of the air flow (Q AIR) being called "centralised", and further characterised in that said control unit: - is set to detect the configuration of simultaneously active burners (BRNi), - is set to detect the opening (α i) degrees of the gas valves of each of said active burners (BRNi), each of said opening (α i) degrees corresponding to a specific operating pressure (DPα i) which also takes into account the characteristic curves of said means (VP; 101; UG) for supplying the said flow of combustion air (Q AIR), said means (VP; 101; UG) consisting of at least one air nozzle with calibrated and fixed opening, is set to determine an operating pressure (DP act) intermediate to the single pressures (DPα i) that each active burner (BRNi) should have, said intermediate operating pressure (DP act) univocally corresponding to a rotation speed (n act) of said fan, said intermediate pressure (DP act) being determined through "mappings", loaded into memory means of said control unit, of all possible combinations of simultaneously active burners (BRNi) according to all their possible power levels. - means (VG, 211; 211.a, 211.b) for supplying and regulating the flow of fuel gas (Q GAS) in input into each of said two or more burners (BRNi) and supplied by a gas channel, said means (VG, 211; 211.a, 211.b) comprising at least one gas injector (211; 211.a, 211.b), - means (VP; 101; UG) for supplying the flow of combustion air (Q AIR) in input into each of said two or more burners (BRNi), said combustion air, supplied from a sealed circuit (CA1, 405, 407), being capable of mixing with said fuel gas, - an electronic unit for controlling said air flow (Q AIR), - is set to detect the configuration of simultaneously active burners (BRNi), - is set to detect the opening (α i) degrees of the gas valves of each of said active burners (BRNi), each of said opening (α i) degrees corresponding to a specific operating pressure (DPα i) which also takes into account the characteristic curves of said means (VP; 101; UG) for supplying the said flow of combustion air (Q AIR), said means (VP; 101; UG) consisting of at least one air nozzle with calibrated and fixed opening,