There are a several primary differences between vented and ventless log sets. Vented logs will need to utilize an existing chimney in good working order. Ventless logs are not designed to utilize the chimney; you simply close the damper in the fireplace where you have installed the log set. It is important to note that while ventless log sets allow the damper to be closed, the chimney must still be in place, just as with vented log sets. Vented logs produce more overall heat, but a great amount of this heat will be drawn up the chimney due to the negative pressure created by the rising heat. As such, vented log sets are primarily designed for ambiance and realism. Since ventless logs do not utilize a chimney, almost all of the heat stays in the room. Ventless logs also open the door to installation into a prefabricated firebox, which does not have to utilize a chimney vent, due to the purpose built and heavily insulated design. For more information on differences and pros and cons, please see our
Gas Log Guide.