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You can, but you shouldn’t. While you can still start a fire in your fireplace, the smoke and other fumes won’t have a proper way to escape if the flue is cracked. By continuing to operate your fireplace, wood stove, or furnace, you are putting your home at risk of absorbing toxic byproducts of the fire source.

Chimneys should either be sealed or waterproofed, which is different from sealing off—closing at both ends—a chimney. Waterproofing and sealing are both crucial steps to take to prevent water damage and the chimney leaking inside the house. While waterproofing is more comprehensive, both help safeguard your chimney, extending its life span and preventing expensive repairs. 

You can burn wood with oak wilt, as heat from the fire destroys the fungus, and smoke won’t threaten healthy trees. However, wood of unknown origin should be burned during the dormant season—do not store wood in the warmer months for the winter season. If you harvest oak, let it dry in the sun before transporting it elsewhere.

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.