Common problems with furnace exhaust pipes are leaks from weathering or corrosion, blockage due to debris, soot or rust, and animal infestation. Furnace exhaust pipes vent harmful gas away from living areas and should be maintained on a regular basis to avoid blockage or leaks.
Soot, dead animals, animal nests, ice, snow, flaking chimney materials and rust are just some of the things that can get into or happen to your furnace exhaust system to cause blockage or leaks. All of them can cause leakage of carbon monoxide into living areas or cause a fire. The ventilation system is the same regardless of furnace type, and annual inspections help prevent potential injuries from fire or carbon monoxide poisoning.