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The primary disadvantage of a ventless fireplace is that it doesn’t have an exterior venting system. This means that the byproducts from combustion are emitted into your home, which raises some safety concerns. In addition, ventless gas fireplaces produce moisture as they burn—and if there’s no ventilation, you could end up with a mold problem.

A spark arrestor is a simple metal mesh device that prevents flammable particles from escaping from a combustion source and causing a fire. You typically find these attached to gas or diesel engines on things like cars, generators, and garden tools (lawnmowers, chainsaws, etc.). Fireplace or wood-burning stove chimneys also have spark arrestors attached to or sitting under the chimney cap to capture burning embers.

Although no heating appliance can be entirely risk-free, a fireplace insert is considered a safer alternative to a traditional open fireplace, thanks to their enclosed design. With a sealed combustion chamber, a fireplace insert effectively reduces the risk of sparks and embers escaping into the room, minimizing the chance of an accidental fire.

Additionally, an insert comes equipped with various safety features, such as tempered glass doors that create a barrier between the flames and the surrounding space. This enhances both safety and energy efficiency by preventing heat loss. As an added bonus, many inserts are designed to meet strict safety standards that ensure proper ventilation and combustion.

The short answer is yes, but the longer answer is more complex. Unless the fireplace is ventless by design, you’ll need some type of exhaust pipe system to safely send fumes and other harmful byproducts out of the house. Even then, ventless fireplaces are not always permitted because they do keep the byproducts inside of your house. Ventless fireplaces are safest when installed in spaces that are themselves well-ventilated, like large rooms with lots of windows.