(57) A urner (1; 1a; 20; 25; 115; 118), suppliable with a mixture of air and fuel, comprising
a burner body provided with a diffuser (4; 4a, 4b; 23; 117; 119) in which openings
are made for the passage and subsequent combustion of said mixture, said diffuser
(4; 4a, 4b; 23; 117; 119) being divided into a plurality of diffuser elements (26;
26a; 26b; 26c; 26d; 44; 46; 57) that are adjacent to one another, each diffuser element
(26; 26a; 26b; 26c; 26d; 44; 46; 57) being at least partially free to expand in at
least one direction, said diffuser element (26; 26a; 26b; 26c; 26d; 44; 46; 57) having
a box structure comprising a first face (28; 47) intended to be turned towards the
outside of the burner (1; 1a; 20; 25; 115; 118) whereupon said openings (6; 27; 41,
42; 51, 52) are made for the evacuation of said mixture, and a second face (29; 48)
opposite said first face (28; 47), intended to be turned towards the inside of the
burner (1; 1a; 20; 25; 115; 118) wherein further openings (31; 32, 33; 34; 54) are
made for the passage of said mixture, said second face (29; 48) acting as a distributing
element of the flow of said mixture, wherein on said second face (29; 49) an incision
(30; 55) is made, that extends along the entire length of said face.
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