In a nuclear power plant emergency, you may be advised to go indoors and, if so, to close all windows, doors, chimney dampers, other sources of outside air, and turn off forced air heating and cooling equipment, etc.
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The dampers allow the chimney to be closed when the fireplace is not in use.
这个节气阀可以在不用壁炉的时候把烟囱关上。
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