(57) [summary] [purpose] activated carbon was packed in a container that was divided by vertical partition, the lower the fuel gas from the top, then to flow through the two rooms and from the bottom to the top, activated carbon in front of the upper air inlet The by providing a U-shaped passage filled, and without completely dissipation of the fuel gas into the atmosphere. [Configuration] The Central activated carbon chamber and the first chamber 5 into the second chamber 6 10,1 3 is provided and are sequentially adsorbed, by providing a U-shaped passage 22 filled with activated carbon before the air inlet 24, to prevent the fuel gas dissipation into the atmosphere.
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