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While you have some flexibility in the types of wood you can use in your outdoor furnace, it's important to make wise choices for optimal performance and efficiency. Hardwoods, such as oak, maple, and cherry, are generally recommended for their higher energy content and cleaner burn. These hardwoods produce more heat per volume and tend to produce fewer creosote deposits, which can accumulate and cause a chimney fire, according to the U.S. Environmental Protection Agency.

You should get your chimney cleaned around once per year, but you might want to opt for bi-annual cleanings if you use your fireplace often. Remember, your boiler likely vents into your chimney as well, so cleaning is required even if you don’t use your fireplace. It’s a good idea to clean your chimney during the summer so that it’s ready to use when you want a worry-free cozy fire on that first crisp autumn night of the season.

You don’t necessarily need a chimney for a pellet stove. However, all pellet stoves need some type of venting system to get rid of gasses and other potentially harmful byproducts of combustion. If you don’t have a chimney, an alternative option is to vent your pellet stove through an exterior wall of your home.

Backdraft is usually caused by a ventilation or pressure problem. To stop it, you need to replace the air your fireplace draws out through the chimney, so open a window to try and increase the airflow. Sometimes turning on a kitchen or bathroom exhaust fan can help, but they could also be the cause of the backdraft depending on the air pressure inside your home. You may need to install a makeup air system (MUAS) or chimney fan.