FIELD: mechanical engineering; heating and ventilating devices regulating smoke discharge from furnace. SUBSTANCE: chimney has exhaust branch pipe 5 with deflector 6, cylindrical hood secured on upper portion of chimney and connected with exhaust branch pipe to form circular slot between branch pipe and chimney. It has also air intake branch pipe and control shutter. Air intake branch pipe communicates with circular slot through channel in hood. Novelty is that channel on chimney is formed by coaxially arranged cylindrical surface of hood. Free cross sectional area of circular slot is two times greater than throttle hole of air intake branch pipe. EFFECT: enlarged operating capabilities. 1 dwg
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