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.

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. 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. Other aspects of high efficiency furnace venting. Vent pipe blocking the exhaust flow.

There are several other important aspects of high efficiency furnace venting. High efficiency or condensing furnaces exhaust the combustion gases and bring in fresh. Traditional gas fired forced air furnaces produce hot combustion exhaust gasses and therefore need metal vent pipes or chimneys.