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You should never block both the top and bottom of your chimney. Proper airflow is essential because the temperature inside the chimney will still fluctuate as your house warms and cools. Moisture can build up without ventilation, leading to dampness in your walls over time. Blocking the top prevents debris and animals from entering, but the chimney still needs air circulation to avoid condensation issues. Allowing the chimney to breathe maintains the health of your home and prevents long-term damage.

Your state, city, or even homeowners insurance company may have requirements on how far the outdoor wood furnace should be from the house, so be sure to abide by those regulations. In general, you should install an outdoor wood furnace or boiler as few as 30 feet or as much as 500 feet from the house or any other building.

There are several ways to determine if your chimney or fireplace damper is open or closed. A simple method is to check for airflow by placing your hand near the fireplace opening; if you feel a draft or hear wind whistling, the damper is open. An open damper might also make the room feel cooler, similar to the outdoor temperature, or cause your HVAC system to work harder than usual. For a more definitive test, you can try a visual inspection, although it may be difficult to see. Alternatively, you can light a small piece of paper and observe the smoke; if it is drawn up the chimney, the damper is open. Always use the damper handle to adjust its position.

Removing and demolishing a fireplace is extremely labor intensive work that also takes a long time. You need to use brute strength to break apart the brick and masonry, and carry the debris to a dumpster. Depending on the size of the structure, you may need multiple days to fully remove it. After removal, you need to determine how you will repair the wall that held the fireplace, which can also be quite time consuming and challenging.