Gas logs are getting a lot more popular each year, because of the convenience and efficiency of gas fireplaces. Manufacturers are now offering a wide selection of options. You can find self contained gas fireplaces, freestanding stoves, and plain old gas fireplace logs. However, the fumes and other residues produced by gas fireplace logs isn't always vented outside. Before you buy, you should know the difference between vented units and those that don't use a vent. It could make a big different in the gas log fireplace you decide to use.
Vented gas fireplace logs have a yellowish flame, which looks a lot like the flame you'd see in a traditional wood burning fireplace. You have the option of picking between propane units or natural gas burning fireplace logs. You'll also have plenty of options for configuring the vent that removes the gases produced by combustion.
Vented gas fireplace logs won't fix a problematic chimney, and if you've used your chimney for wood burning before, you must have it professionally cleaned before installing gas logs. If you don't have a chimney, talk to your installer about top venting or direct venting options, depending on whether you'd like to vent through the roof or through the outside wall behind the fireplace. If you have gas logs of any kind installed with a vent, you may have to block the damper in the vent or chimney open permanently, which can reduce heat efficiency.
Vent free gas fireplace logs tend to produce a blue flame, which provides a more complete consumption of fuel. This means that less carbon monoxide and soot are produced than with vented logs. However, vent free logs aren't permitted in all areas, and the look is less like a traditional fireplace. Unvented gas fireplace logs always have a sensor to determine whether there's too much carbon monoxide in the room. If the level of oxygen is too low, the fireplace will turn off before a dangerous level is reached. However, if you choose this kind of gas fireplace log, you'll want to install several carbon monoxide detectors in your home (a good idea anyway).
You can install unvented gas fireplace logs in a regular masonry fireplace, or in a firebox made to look like a hearth. If your logs produce too much moisture, you could see condensation on the windows. This usually isn't a problem, however, as many homes are uncomfortably dry in the winter. You should also remember to take adequate safety measures when using vent free gas fireplace logs. Although they're built to be as safe as possibly, never use them for long periods of time. Keep anything burnable away from the fireplace, and never sleep with the gas logs burning. You can also crack a window while the logs are in use to provide fresh air.
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