The backdraft dampers help ensure that the air flows and keeps on flowing in the right direction. It works by preventing a backflow of the air. A backflow of the air could lead to poor ventilation of the room or space, which in the long run causes discomfort to its occupants. The backdraft damper sets this right and ensures there is proper flow of air as is expected.
An added advantage to these dampers is that it stays closed when the fan is off. It helps prevent insects, drafts, and other debris from getting into the air tube. Such drafts, insects, and debris could otherwise fall into the tube and clog the fan thus reducing its functionality. The backdraft dampers help solve this problem by ensuring it remains closed whenever the fan is not running.
It is an efficient device in the maintaining the balance of air circulation. It should be fitted properly to ensure proper air flow.