High Efficiency Gas Furnace Combustion Air Intake

The combustion air intake usually is piped from the exterior of the home to the furnace.

High efficiency gas furnace combustion air intake.

This will provide free airflow to the combustion chamber. However condensing furnaces can also be installed as single pipe non direct vent configurations in which the combustion air is drawn from the indoors. Fortunately you are correct that your new high efficiency furnace should have an integral combustion air intake duct that supplies air directly to the combustion chamber. These types of furnaces have a dedicated pipeline that runs directly from an outside vent into a sealed combustion chamber of the furnace and a sealed vent to the outside of the home for venting the toxic fumes from the combustion process.

According to the u s. The pvc pipes are used for air intake exhaust gas and to remove the corrosive condensation resulting from the combustion process. This means the furnace does not take air already heated by the furnace and use it for combustion. Since high efficiency furnaces draw air directly from outside the furnace itself does not require a fresh air intake in order to replace inside air.

Department of energy a defining feature of high efficiency furnaces is sealed combustion a process by which outdoor makeup air is piped directly into the burner. An obstructed air intake vent pipe in a direct vent two pipe system will cause serious combustion problems in a condensing furnace. Check to see if the furnace combustion problem is caused by an obstructed air supply pipe by removing the burner compartment cover.