What does a barometric damper control?

A barometric damper is designed to regulate draft air in a system. Draft air refers to the movement of air within a flue or chimney that helps facilitate proper venting of combustion gases from appliances such as furnaces and water heaters. The damper automatically adjusts in response to changes in pressure, ensuring that there is neither too much nor too little draft. This adjustment helps maintain efficient combustion by ensuring that the appliance operates within the optimal air requirements, while also preventing the backflow of combustion gases that could be harmful.

By controlling the draft air, the barometric damper plays a crucial role in maintaining safety and efficiency within heating systems, allowing for better control of combustion conditions. This function is essential for achieving effective venting while minimizing any risks of excessive drafts or incomplete combustion.