An air-cooled gas burner, comprising: - a plurality of ramp-like elements, each of which is disposed along a respective extension plane, parallel to a longitudinal direction and to an intake direction and includes a first intake duct and a second intake duct, having a respective inlet (21A, 22A) and an outlet (21B, 22B), wherein the first and the second intake duct (21, 22) are oriented in the extension plane of the respective ramp-like element and are spaced from each other along the longitudinal direction, and wherein the plurality of ramp-like elements are disposed in succession along a transverse direction perpendicular to the longitudinal direction and to the intake direction; - a manifold, configured to feed the gas to the inlets (21A, 21B) of the first and second intake ducts (21, 22) of the plurality of ramp-like elements, wherein the first and second intake ducts (21, 22) of the plurality of ramp-like elements are configured to suck the gas and primary air into their respective inlets (21A, 22A) by the Venturi effect; - for each of the plurality of ramp-like elements, a respective diffuser, disposed at the outlet (21B, 22B) of the first and of the second intake duct (21, 22), and defining a plurality of holes from which a flame is generated by combustion of the gas coming from the first and the second intake duct (21, 22); - a plate positioned between the first and second consecutive ramp-like elements, wherein the plate defines an opening for the passage of secondary air, wherein, for each of the first and second consecutive ramp-like elements, the diffuser extends along the longitudinal direction and defines a respective row of holes disposed in succession along the longitudinal direction, wherein the opening for the passage of secondary air has a length which, along the longitudinal direction, is at least equal to the length of the row of holes along the longitudinal direction. - a plurality of ramp-like elements, each of which is disposed along a respective extension plane, parallel to a longitudinal direction and to an intake direction and includes a first intake duct and a second intake duct, having a respective inlet (21A, 22A) and an outlet (21B, 22B), wherein the first and the second intake duct (21, 22) are oriented in the extension plane of the respective ramp-like element and are spaced from each other along the longitudinal direction, and wherein the plurality of ramp-like elements are disposed in succession along a transverse direction perpendicular to the longitudinal direction and to the intake direction; - a manifold, configured to feed the gas to the inlets (21A, 21B) of the first and second intake ducts (21, 22) of the plurality of ramp-like elements, wherein the first and second intake ducts (21, 22) of the plurality of ramp-like elements are configured to suck the gas and primary air into their respective inlets (21A, 22A) by the Venturi effect; - for each of the plurality of ramp-like elements, a respective diffuser, disposed at the outlet (21B, 22B) of the first and of the second intake duct (21, 22), and defining a plurality of holes from which a flame is generated by combustion of the gas coming from the first and the second intake duct (21, 22); - a plate positioned between the first and second consecutive ramp-like elements, wherein the plate defines an opening for the passage of secondary air,