| 摘要 |
PURPOSE: A boiler is provided to prevent air pollution, and to reduce heating cost by using wood as fuel and reducing noxious gas. CONSTITUTION: A boiler has a combustion case(2) and a flue(3). The flue is installed at the upper part of the combustion case, and is communicated with the rear of the combustion case. A pipe(4) is wound around the outer circumference of the combustion case. A space unit(5) is formed between an outer case(1) and the combustion case(2).
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