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Yes, removing a chimney is a difficult and major undertaking. Chimneys often provide structural support to a home, so if it's a load-bearing structure, you'll need to take extra precautions to maintain your home's integrity. A project of this complexity typically requires a structural engineer, a masonry contractor, and a demolition crew. The removal process may involve taking the chimney out brick by brick from inside the walls. The cost for chimney removal can range from $2,000 to $10,000, depending on the job's complexity. Due to the difficulty and cost, some homeowners opt to remove the fireplace and seal the chimney at the top and bottom, sometimes also removing the visible exterior portion at the roofline.

Backdraft is usually caused by a ventilation or pressure problem. To stop it, you need to replace the air your fireplace draws out through the chimney, so open a window to try and increase the airflow. Sometimes turning on a kitchen or bathroom exhaust fan can help, but they could also be the cause of the backdraft depending on the air pressure inside your home. You may need to install a makeup air system (MUAS) or chimney fan.

The most common sign of a carbon monoxide leak is the visible black soot marks on the walls near your wood stove. An excess accumulation of smoke in other rooms of your home could also indicate that your wood burning stove is leaking carbon monoxide. If you notice either of these signs or are still unsure, it’s best to leave the premises and contact your fire department to check your home’s levels. 

Some homes with wood-burning fireplaces don't have ash pits due to design choices, construction practices, or the age of the house. Many older abodes don't have them because ash pits weren't a standard feature when they were built. Additionally, in smaller homes or homes with less frequent fireplace use, builders might have opted to forgo an ash pit to reduce costs or simplify maintenance.