If you're using firewood as fuel, the answer is no—wood-burning fireplaces must be vented vertically through a chimney. However, vented gas fireplaces can often be vented through a wall, depending on the type of fireplace:
- Direct Vent Fireplaces: These can be vented through an exterior wall, as they pull in outside air for combustion and expel exhaust gases outside.
- B-Vent Fireplaces: These usually require vertical venting but may have flexible installation options.
It's important to follow the manufacturer’s guidelines and local building codes when considering venting options.