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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.

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.

Once your ashes have fully cooled, you can place them in a heavy-duty trash bag and put them into the bin with your normal trash. If you have wood ash, you can add the ash to your composting pile or sprinkle it over your grass or plants directly for added nutrients.