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Ventilation systems and their role in home comfort Ventilation is an important component of any home or business and is often associated with home heating and cooling systems. Improper ventilation can be, and often is, the root cause of indoor air quality problems. In fact, sanitary standards include requirements for ventilation in the workplace. Simply put, ventilation: air exchange from the outside, as well as air circulation inside the room or room. Opening that window in your home or office on a fine spring day is a form of ventilation that is aptly referred to as "natural ventilation." Typically used in homes or small offices. Simply following the rules of natural ventilation can significantly improve indoor air quality. Many people feel better and wake up fresher if they "ventilate" at night by leaving the window open.