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No. Removing the cause of concern will only lead to deeper concern. You cannot use any fire-powered appliance like a fireplace or furnace without an escape route for the smoke and fumes. If you remove the flue intending to repair or replace it, you should only use the fireplace, wood stove, or furnace once the flue is in working order. If you cannot replace the flue you have removed, call a chimney repair professional immediately.

Chimney liners often benefit from insulation, though it is not always required. Insulation helps improve the liner's efficiency by keeping flue gasses hotter, which enhances draft and reduces creosote buildup. It also prevents condensation, which can lead to corrosion. Insulation is important for chimneys on exterior walls or in colder climates. Some building codes may require insulation, so checking local regulations is essential.

It’s possible to clean your chimney by accessing it from the opening above your fireplace, but be aware that this method is messier because you will be pulling loose buildup of soot, ash, and creosote into your fireplace instead of up, out, and onto the roof. While the bottom-up method can cause more of a mess, it’s a good option if you’re not comfortable getting on the roof.

Burning wood and wood products such as pellets create carbon monoxide that’s poisonous to humans and pets. Pellet stoves need to vent to the outside through an approved vent or chimney to expel the exhaust.