一个抽气罩必须开启燃气灶具期间的操作。

An air extraction hood must be switched on during operation of the gas cooktop.

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瑞典进口FUMAX万向抽气罩：所有的管子和关节采用PP材料和与气流接触的金属部件采用不锈钢材料。

Sweden FUMAX Fume exhaust: all pipes and joints are made of PP and all metal components in contact with the air flow are made of stainless steel.

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在罩式电炉内处理，采取液氮作为保护气体，并设真空抽气设备。

Liquid nitrogen is adopted as protective atmosphere in bell type furnace for which vacuum pumping system are provide also.

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