FIELD: heat treatment of materials. SUBSTANCE: opposite walls of shaft furnace are interconnected by means of shelves made of angles with their tops upward. Shelves form connecting passages which couple together opposite sides of circular gas duct through the ports. Additional angles are secured as cantilevers to gas duct walls and are mounted in the ports. Section of additional angles is equal to section of main shelves made of angles which are mounted at spaced relation to gas duct walls and rest on additional angles. EFFECT: enhanced reliability. 2 dwg, 1 tbl
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