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A chimney without a liner is not recommended. Chimney liners protect the surrounding structure from heat, reducing the risk of fire or structural damage. Just as important, liners prevent carbon monoxide and other toxic gases from leaking into your abode by guiding smoke and gases out more effectively. Remember, installing a liner ensures safety and extends the life of your chimney.

There are fire codes for a fireplace mantel made of wood or other combustible material. The mantel must be mounted at least six inches away from the fireplace opening on all sides with a non-combustible material—like stone or brick—installed between the mantel and fireplace. Building codes and regulations will vary based on your location, so before beginning the project, research the requirements in your area.

A hot fire alone will not remove significant creosote buildup and can be dangerous, as it risks causing a chimney fire. While the warmth from a fire can help loosen stuck tar, making treatments like creosote logs more effective, it is not a substitute for proper cleaning. For existing creosote, the safest and most effective method is to have your chimney professionally cleaned by a chimney sweep.

In general, it will take about 90 minutes to burn the creosote sweeping log by itself, allowing it to work its magic. This may be longer or shorter depending on the conditions of your chimney.