A blocked or damaged furnace flue prevents combustion gases from escaping outside. Instead these gases are released into your home. Once inside, they recirculate, and then carbon monoxide becomes part of the air taken in during the combustion process. This increases the amount of carbon monoxide present.Click to see full answer. Accordingly, how do you unclog a furnace vent? Follow the steps below to clean out a gas furnace vent pipe. Step 1 – Locate Exterior Vent of Gas Furnace. Firstly, consult the operating manual of the gas furnace and read through the instructions mentioned. Step 2 – Start Cleaning up Vent Pipe. Step 3 – Ensure No Blockage is present in Vent. Step 4 – Close up Vent. Also, how do you tell if your flue is blocked? A blocked chimney may be hard to diagnose on your own but there are some telltale signs to watch for. These warning signs include: A smoky smell when burning a fire. Falling debris inside the hearth. Water streaks inside the flue. Excessive soot. White residue on the flue walls. Considering this, is the exhaust from a gas furnace dangerous? Gas furnaces burn natural gas to produce heat. A by-product of this combustion process can be carbon monoxide, a very dangerous exhaust gas. In standard furnaces, all these combustion gases including carbon monoxide are usually vented through chimneys or flues.How do I check the airflow on my furnace?If you are looking at a furnace filter, find the arrow that indicates the proper air flow direction. That arrow must always face toward the furnace and away from the return duct that carries the air in need of heating or cooling.
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