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Maintaining a Wood Burning Fireplace Nothing is more welcoming than the roar of a wood-burning fireplace. If you have one, it is essential to keep it maintained regularly to avoid the risk of dangerous build-ups of creosote. A damper is an important part of maintaining a good combustion. Hardwoods like oak and ash are less likely to produce creosote. Energy Efficiency Wood fireplaces can be a stunning amenity, creating a warm and cozy ambience. They aren't efficient in terms of energy and could cause pollutant emissions if not maintained correctly.