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Efficient movement of air through a building is a critical component of any forced-air HVAC system. A furnace or air conditioner unit will either heat or cool the air before an , consisting of a motor driven fan, pushes the treated air through the ducting system which channels it throughout the building. The air-handling unit must be capable of overcoming the static air pressure demands of the ducting system, which act to oppose air flow.
Another important aspect of properly ventilating a building is circulating fresh air from outside the building with the heated, or cooled air that is driven through the ductwork. This helps keep fresh, oxygen rich air at safe and healthy levels, and stops the buildup of carbon dioxide inside the building.
The component of an HVAC system which drives air through the building.