An open fireplace known to us through old castles, films or museums is barely installed today. The open fireplace is mainly a visual effect.
These fireplaces are approximately 20% efficient and are only suitable for the combustion of solids. It is not recommended to use an open fireplace today because on the one hand, it represents a great danger from the incoming exhaust gases and on the other hand, of course, represents a much greater risk of fire. The immission protection law stipulates that an open fireplace may only be put into operation "occasionally" and never on a daily basis.
In comparison, the modern stoves or closed fireplaces have an efficiency of almost 90% and push the toxic exhaust gases in the air outside the building and the installation room.