| 摘要 |
A first head-loss adjusting member (12) is located in a first pipeline (6) joining a suction hood (5) and a combustion chamber (7) and controlled by a regulating means (13) connected, so that it can be driven, to a pressure sensor (14) located in the chamber of the furnace (2), close to the stage (4) where the gas and fumes are emitted. An additional air inlet pipeline (15) is connected to a pipeline (10) joining the filter (9) to the fan (blower) (11). A second head-less adjustment member (16) is located in the additional pipeline (15) and controlled by a regulating means (17) driven by a pressure sensor (18) located in the pipeline (10), in the vicinity of the suction of the fan (11). <IMAGE>
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