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Vent-Free Gas Log Fireplaces

Are Unvented Gas Logs the Right Solution for Your Home?

When you shop for gas logs you'll find there are two basic types, gas logs that vent to the outside just like a wood burning fireplace and gas logs that are not vented at all.

Burning gas or wood produces carbon monoxide, a potentially lethal gas, so you might wonder how a fireplace can be safely used without venting its wastes to the outside. Unvented gas logs are designed to produce a very hot flame that results in nearly complete fuel combustion, decreasing the levels of carbon monoxide and soot that are produced by other gas logs.

Unvented gas logs are always equipped with an Oxygen Depletion Sensor (ODS), which is designed to turn off the gas before carbon monoxide reaches a dangerous level in the room.

It's a good idea to install one or more carbon monoxide detectors in your home, no matter what type of fuel-burning appliance you have. Detectors are an inexpensive way to put your mind at ease about carbon monoxide levels.

Where Can Unvented Gas Logs Be Installed?

Unvented gas logs can be housed in a masonry fireplace or in special fireboxes made to resemble a hearth.

If Your Gas Logs Create Moisture

Water is another byproduct of combustion. If you have vented gas logs, most of the moisture escapes out the vent, but when you use unvented gas logs the extra moisture enters your home. That can be a plus for many homes during dry winter months, but if your home is tightly insulated, or you have a humidifier, the excess moisture might show up as condensation on cold windows.

Gas Log Safety

  • Unvented gas logs generate a lot of heat. Keep combustibles away from the fireplace.

  • Always leave the fireplace doors open during use.

  • Only burn the gas logs for a few hours at a time. Never go to sleep and leave unvented gas logs burning.

  • Open a window slightly while the gas logs are burning, to let fresh air enter the room.

  • Bigger is not always better. For best air quality, the gas fireplace unit you install should be approved for the size of the room it will be used in.

  • Unvented gas logs are not legal in all areas, so check your local building codes before buying a gas appliance.

  • Always follow the manufacturer's instructions when using any type of fuel-burning appliance.

Learn About Vented Gas Fireplaces

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