| 摘要 |
PROBLEM TO BE SOLVED: To provide a multi-stage smokestack for preventing the occurrence of harmful substances such as carbon monoxide, dioxin or the like by complete burning at a high temperature by increasing the amount of oxygen suction. SOLUTION: A spiral stripe groove 3 is formed in a longitudinal direction at the outer periphery in upper portion, a truncated conical short cylindrical smokestack 1 having a joint portion 7 is formed at the lower portion, a plurality of grouped smokestacks 5 are jointed together by sequentially stacking other smokestacks having the same size and the same shape are fitted and tightly adhered by the joint portions of the smokestacks 1 up to the near of the bottom end of the spiral stripe groove 3 of the smokestack, and the strip groove 3 is formed to an air duct.
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