Answer :
Final answer:
A barometric damper is used in HVAC systems to control the amount of draft air that enters the system by responding to changes in pressure within the system.
Explanation:
A barometric damper is a device used in heating, ventilation, and air conditioning (HVAC) systems. It helps control the amount of draft air that enters the system. When considering the options provided - Excess Air, Pilot Air, Draft Air, and Ventilation Air - the correct answer would be C. Draft Air.
Barometric dampers achieve this control by opening and closing depending on the pressure in the system. When there's high pressure, the damper stays closed, preventing excessive draft air from entering. When there's low pressure, it opens, allowing more air to flow in to maintain optimal function.
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