The real revolution occurred when engineers figured out a way to produce a yellow flame with these sets, while still achieving a clean burn. Many folks are curious how you can burn a fuel in the home and have little on no effect on the air quality in the home. The easiest way to understand is to use your Kitchen Gas Range as an example. A range uses a special burner design to achieve a clean, smokeless flame. Unvented gas logs use a similar technology.
Unvented logs are also economical to use.
These logs do have yellow flames and glowing embers, but they do not look as real as the Vented Logs. This is due to the smaller BTU rating and the clean burning design. There is some controversy over unvented logs. People with asthma, or other respiratory sensitivities may find the slight odor and small decrease in room oxygen levels uncomfortable. This may be a bigger concern in newer, tightly constructed homes.