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The damper, located just above the firebox, can open or close the chimney flue. The damper should remain closed unless there’s a fire burning in the fireplace. Closing the damper prevents energy loss through the chimney and cold air from seeping into the home during the winter. Opening the damper helps maintain airflow when there is a fire and prevents smoke and gases from venting into the house.

Well-seasoned hardwoods like oak, maple, hickory, and ash are the cleanest woods to burn in a fireplace. When properly dried, these woods have low moisture content, allowing them to burn hotter and produce less smoke, which minimizes creosote buildup. Ensure the wood is seasoned for at least six months for optimal burning.

Compared to certain types of firewood like pine or spruce—which burn off sticky resin contained within the wood that creates lots of smoke—elm isn’t the worst option for burning in a fireplace.

Because elm wood is dense, it burns at a moderate pace and does a pretty good job of keeping your home warm. Hardwood like maple or oak may perform slightly better, but elm isn’t a bad choice overall.

In short, yes, gas fireplaces create fewer pollutants and are considered more environmentally friendly than traditional ones. In general, natural gas fireplaces release only half to two-thirds as much CO2 per unit of heat (BTU) as burning wood. Plus, gas fireplaces emit fewer harmful particles and air pollutants. They can also be about three times as efficient as wood in terms of heating your home, resulting in a much higher level of their energy converting into heat.