Irmentrud Vreni Fireplace January 25th, 2018 - 12:23:17
Many of the new prefabricated, metal fireboxes don't even require a chimney. Only if the fireplace is meant to be wood burning is there a need to vent smoke up and out. If it's solely a gas-burning fireplace, a direct vent (directly outside behind the fireplace) or a no-vent solution works just fine.
Avoid architectural features. The flue can also bend and be rerouted to avoid architectural features such as overhangs. Again (this can't be stressed enough), follow the building codes and manufacturer specifications when doing any chimney installation.