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The National Fire Protection Association (NFPA) says that chimneys and their associated elements like fireplaces, vents, or stoves should be cleaned at least once a year before the start of seasonal use. According to the Chimney Safety Institute of America, a chimney should be cleaned when there is 1/8 inch of soot buildup. If there’s more than that, creosote—a flammable byproduct of burning wood—can form and increase the risk of a chimney fire.

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.

If you don’t clean your chimney regularly, it can result in a build-up of creosote that can ignite and cause a chimney fire. In addition, creosote build-up can result in poor venting of smoke, soothes, and carbon monoxide, making the air quality indoors dangerously poor. Creosote is also acidic and can damage mortar and metal over time, allowing smoke to leak into your home.

Yes, if your gas fireplace has a flue, you typically need to open it when using the fireplace. Although gas fireplaces don’t produce the type of smoke and soot that wood-burning ones do, they still release combustion gasses like carbon monoxide. Opening the flue ensures these gasses safely exit your home through the chimney. Not all gas fireplaces need a chimney, however. Always check the manufacturer’s instructions for your specific gas fireplace model, as some newer models may have different ventilation requirements.