FIELD: construction.
SUBSTANCE: device comprises a heating tubular element with exhaust holes in its bottom part, which is fixed along the contact with the roof edge and arranged on its section or along its perimetre to form a closed circuit, and this element is connected to a transport air duct arranged in a stack with arrangement of its air-intake end below exhaust holes. At the same time the air-intake end of the transport air duct is arranged away from the stack or aside from the combustion zone and is equipped with a plug.
EFFECT: higher device operational reliability.
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