Fresh air in HVAC refers to clean outdoor atmospheric air that is intentionally introduced into a building's climate control system to replace stale indoor air, replenish oxygen levels, and dilute indoor pollutants. While traditional HVAC systems operate on a closed loop that merely recirculates existing indoor air, a fresh air integration uses dedicated outdoor intake ducts, motorized dampers, and often energy recovery ventilators to pull outside air into the return plenum. This ensures that occupants receive a continuous supply of oxygen-rich air, preventing the accumulation of metabolic carbon dioxide, volatile organic compounds, and cooking odors, thereby maintaining a healthy and breathable indoor environment without compromising thermal comfort.
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