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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.

In some cases, you can use a fireplace once the insert has been removed. However, before burning a fire, you must have a professional inspect it and the chimney to make sure they're functioning properly and no damage has occurred from removing the insert. That’s because using a fireplace without an insert could create fire hazards due to issues with airflow and heat dispersion, depending on the fireplace design and material. A professional can advise on whether you should make certain repairs or modifications before using your fireplace as an open hearth.

A gas fireplace insert costs about $3,600 to install, on average. The cost to install a gas log insert ranges from about $700 to $6,500, depending on the size, type of insert, how it works, and heating needs. Gas fireplaces need electrical and gas lines installed properly, so hiring a pro is recommended rather than trying to DIY installation.

Yes, you need to leave your chimney damper open when burning a creosote log so that smoke and other debris doesn’t waft into your house as it’s burning. You’ll need to make sure your damper is fully open, even when the log continues to smoke, until it’s completely out and cold.