An air vent is a small opening or a device used to allow air to flow in and out of a space, helping to regulate temperature, humidity, and air quality. Air vents are commonly found in walls, ceilings, or floors and are often part of a heating, ventilation, and air conditioning (HVAC) system. They help maintain fresh air circulation by allowing the movement of warm or cool air between rooms or from outside to indoors. Air vents can also prevent the buildup of moisture or pollutants in a room by promoting airflow.

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