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Not all gas fireplaces need a chimney. If you install a ventless gas fireplace, it will release low levels of combustion byproducts back into your living space (instead of pushing them outside through a chimney or vent). Ventless fireplaces burn fuel efficiently, so the emissions are minimal—but they could bother people with allergies or respiratory issues.

A chimney cap costs about $300 on average to install, with prices ranging from $75 to $1,000. The final cost depends on several factors, including the professional you hire, the accessibility of your chimney, the cap's material and size, whether any repairs are needed, and if it requires custom fabrication. Chimney caps are usually made from galvanized steel, stainless steel, or copper. Copper caps are the most expensive, followed by stainless steel and then galvanized steel. Excluding labor, average material costs are around $100 for galvanized steel, $250 for stainless steel, and $600 for copper. You may also face additional costs, such as hiring a chimney sweep to clean the chimney before the cap is installed.

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.

Depending on who’s doing the estimating, about 22,000 to 25,000 chimney fires happen each year in the United States. Given the fact that millions of Americans have fireplaces (and chimneys), that means chimney fires aren’t exactly common—but they’re not rare, either. Since they’re so dangerous, it’s important to take precautions to prevent them.