A system component draws in outside air to supply a heating appliance. This process ensures a continuous supply of oxygen for efficient combustion and helps maintain indoor air quality. For example, a dedicated duct connecting the furnace to an external vent provides this essential input.
Introducing outside air offers significant advantages. It reduces the potential for negative pressure within the building, preventing backdrafting of combustion gases from other appliances. It also dilutes indoor pollutants, contributing to a healthier living environment. Historically, structures relied on natural infiltration for ventilation; however, controlled introduction of outside air offers greater precision and efficiency.