Downdraft furnace. In a downdraft design, the flow path tends to push heated air downward into the ductwork or return path before it exits through the vent. Dec 16, 2025 · A Downflow Furnace (also called a Counterflow Furnace or Downdraft Furnace) draws cool return air from the top of the unit and pushes heated air out through a bottom-facing supply plenum, making it well suited for specific home layouts and HVAC configurations. They offer flexibility in installation locations, making them versatile for many home designs. Buy your downflow gas furnace on LennoxPros, a trusted HVAC supplier for contractors. Each style affects heat distribution, energy consumption, and maintenance differently. Downflow furnaces have a disadvantage in the heating season because they need to counter the natural tendency of hot air rising and are therefore less effective. Key components include the burner, heat exchanger, blower, and thermostat. While most modern homes use upflow or downflow furnaces, the updraft versus downdraft distinction remains relevant in certain traditional or specialized systems and in some wood-burning and industrial setups. Downflow furnaces are priced very similarly to upflow furnaces. In this detailed guide, we will delve into the workings of downflow furnaces, provide installation and maintenance advice, and highlight the energy efficiency and cost savings these systems offer. hvpst itwhol ralr remaf efeot ywdyc czmbck khdbe bkpa qzcog