FIELD: heating systems for various objects; preheating air fed to mines. SUBSTANCE: unit includes combustion chamber, air preheater, fan, smoke exhauster and pipe lines. Proposed unit is provided with hot air distributor and cold and hot air mixing chamber located in air supply located before mine fan; smoke exhauster is located at gas outlet and is mounted with fan for forming rarefaction in gas flow and pressure in air flow; hot air distributor is made in form of tubular ring provided with slot across cold air flow and connected to hot air pipe line. EFFECT: reduced expenses for air preheating; avoidance of penetration of flue gases into air fed to mine. 3 dwg
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