FIELD: gas-fired furnaces. SUBSTANCE: combustion is effected in combustion chamber; combustion products possessing high temperature and high velocity flow in circular path from combustion chamber to exhaust through finned tubular passages. Heat from combustion products possessing high temperature and high velocity is transmitted to finned tubular passages. Air blast unit makes air flow through finned tubular passages and combustion chamber for removal of heat from finned tubular passages and transmission of this heat to building or to closed part of it. EFFECT: enhanced efficiency. 19 cl, 17 dwg
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