High Efficiency Gas Furnace Exhaust Temperature

Mid efficiency furnaces have an afue annual fuel utilization efficiency of 80 and high efficiency furnaces have an afue of 90 98.

High efficiency gas furnace exhaust temperature.

This high efficiency venting system must be installed when you install the new furnace. The pvc pipes are used for air intake exhaust gas and to remove the corrosive condensation resulting from the combustion process. In high efficiency models the lower temperature of the exhaust can allow moisture a by product of combustion to condense in the flue especially when outdoor temperatures drop into the 20 s or below. High efficiency or condensing furnaces exhaust the combustion gases and bring in fresh.

In contrast modern high efficiency condensing furnaces exhaust much cooler gasses and need only plastic pipe materials such as pvc cpvc or abs for their exhaust vents some high efficiency furnaces also include a plastic pipe for intake area and all types. Traditional gas fired forced air furnaces produce hot combustion exhaust gasses and therefore need metal vent pipes or chimneys. Vent pipe blocking the exhaust flow.