FIELD: heating devices. SUBSTANCE: basic and additional fans have inputs communicated with intake chamber. The chamber is provided with vertical partition with hole; the partition is mounted between outputs. The partition separates the chamber to two sections. Air-intake pit is connected to the section which communicates with input of additional fan. Air heater is connected with the partition in opposite to the hole at the side of the section which communicates with input of basic fan. EFFECT: improved efficiency. 2 dwg
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