For most common house designs this means that the fireplace and chimney should be located on an interior wall rather than a perimeter wall.
How to add a fireplace to an interior wall.
Direct vent direct vent and power vent fireplaces typically vent out the exterior wall but there are units that can make significant vertical runs which again allows for venting through the roof.
When the fireplace is operating heated air travels through the venting system via power vents which are powerful sleek fan powered accessories that push air through the twists and turns of the venting.
This type of fireplace can be installed anywhere a chimney can be installed which allows the homeowner to consider installation along an interior wall.
If you want to add a wood burning fireplace you need space above to get a chimney through the roof.