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One cannot just take the vent off an 80% efficient furnace and run it out a side wall. It would auxiliary power inducer. The combustion air flow through the furnace must be controlled or its efficiency will decline. The barometric damper will prevent pulling additional excess air through the furnace.

Follow the step to inspect the flue pipe 1) Remove the flue cap to check for blockages such as debris or birds' nests 2) Replace and secure the cap tightly to the end of the flue pipe 3) Look for signs of blockages by examining the pipe itself water streaks or rust on the flue pipe may indicate a blockage, causing moisture to back up.

5 Signs You Should Have Your Ducts Cleaned 1. You haven't changed the air filter in months. 2. The registers and vent covers have visible dust. 3. You detect mold in or around your HVAC System. 4. Airflow isn't consistent from room to room. 5. You can hear noises in the ductwork.

In a standard-efficiency furnace, a flue pipe is attached to the heat exchanger and combustion gases exit the heat exchanger through that pipe. Newer mid-efficiency systems have a draft inducer fan that forcefully pushes combustion gases out of the heat exchanger and into the flue pipe to be exhausted out of your home.

High-efficiency furnaces use sidewall vents for breathing in outside air for fuel combustion, and exhaling cooled exhaust gases nearly depleted of heat.

Boiler flues are a crucial part of your heating system. If your boiler isn't burning the gas correctly, carbon monoxide could be produced too. Boilers are made to be safe, and these gases shouldn't harm you. However, a blocked flue can mean the gases become trapped in your home, causing you to breathe them in.