An adjustable plate, as in the flue of a furnace or stove, for controlling the draft.
An adjustable plate, as in the flue of a furnace or stove, for controlling the draft.
挡板，调节风门一种可调节的薄片，如在熔炉或火炉的通气管中的，用来控制气流
An adjustable plate, as in the flue of a furnace or stove, for controlling the draft.
挡板，调节风门一种可调节的薄片，如在熔炉或火炉的通气管中的，用来控制气流