Vent free logs can either be installed in an existing wood burning fireplace or a vent free firebox. Vent free gas logs are designed to burn the gas completely producing little to no exhaust and are able to burn with the flue closed. The distinct advantage of this is that the heat output is greater than a vented log system as well as a lower usage of gas.
These products don’t have the very realistic flame pattern, flame height or color that the vented logs offer instead have a vigorous blue flame. The installation of vent free logs is restricted by certain state and local codes and usually has to be installed by a professional. There are some cities and areas in both California and Texas where vent free logs are not allowed.