![]() Low or negative indoor air pressure – When exhaust fans and dryers are pushing air out of the home, there is a potential for low indoor air pressure which can create a back-draft of the gas furnace exhaust.Insufficient combustion air – When a gas furnace is installed in a small room without proper door vents (i.e., one on the top of the door and one on the bottom of the door), there will not be enough fresh air for proper venting.Incorrectly installed exhaust piping – If the exhaust piping has a horizontal or downward slope, multiple bends, or diameter reduction, it can result in the exhaust gases being released directly into the room.Plugged vent pipe or chimney – For a natural vent furnace, an obstruction in the vent pipe or chimney can prevent exhaust gases from rising up and out properly, causing CO and other fumes to be released into the home.For severely cracked heat exchangers, it is possible for CO to leak out of the exchanger and into your environment. A cracked heat exchanger - Because the furnace heat exchanger is made of metal that contracts and expands as your furnace turns on and off, it can crack after many years of use. ![]() Here are some issues that can contribute to CO buildup caused by your furnace: An airtight home means one in which outside airflow is restricted, a process inhibits CO from dissipating in situations where a gas furnace is improperly installed or experiencing issues. Initially, a gas furnace produces small amounts of CO, but if it is not properly maintained, it can begin to burn “dirtier,” emitting larger amounts of CO.Ĭontributing to the issue are today’s modern “tight” homes that are built to be energy-efficient - and airtight.
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