FIELD: heating stoves. SUBSTANCE: chimney stack has direct-flow chimney and flue duct with heat-insulating and sealing gaskets inbetween. Flue duct is built up of two pipes mounted in a spaced relation: internal pipe is made of thin material and external, reinforcing one, of cast iron or high-carbon steel. Space between chimney and flue duct may be filled with cellular-structure material. EFFECT: improved design. 2 cl, 1 dwg
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