HVAC systems can be classified as providing which type of ventilation?

HVAC systems are primarily designed to provide mechanical ventilation. This type of ventilation involves using fans and other equipment to actively move air within a space, ensuring that fresh air is circulated and stale air is expelled. Mechanical ventilation plays an essential role in maintaining indoor air quality, regulating temperature, and controlling humidity levels in an efficient manner.

Natural ventilation, in contrast, relies on natural airflow through windows and vents due to wind and temperature differences, making it less controlled than mechanical systems. Forced ventilation typically refers to a method of delivery that requires external power sources, and while it may seem similar, it doesn't encompass the full scope of what mechanical ventilation systems accomplish. Passive ventilation refers to systems designed to naturally facilitate air movement without mechanical assistance, which again differs significantly from the active and controlled nature of HVAC.