FIELD: heat treatment of articles. SUBSTANCE: furnace comprises extensible hearth, burners arranged in side walls of chamber on different levels, outlets on hearth level for combustion products, and grilled walls with holes of varying diameter in height installed before lower row of burners. Diameter of holes in grilled wall is 2.5-3.0 its thickness. Grilled wall is located at a distance from the side wall, said distance being equal to 4.5-6.5 diameters of the lower row of holes. EFFECT: improved design. 2 dwg, 1 tbl
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