Some conditions can guarantee the production of soot. In most cases incomplete combustion starts with the inappropriate adjustment and setup of the appliance. However, several factors must be considered when attempting to diagnose a sooting fireplace condition. Remember that two or more of these factors could be involved.

· Is the log placement correct?

· Proper primary air adjustment for each burner

· Excessive ember material

· Improper placement of the lava rock

· Is the fireplace over or under fired?

· Direct venting not properly sealed or blocked

· Direct vent gasket Leaking flue gas

· Atmospheric effects on B- vent and insert models

· Improper orifice alignment

· Valve and orifices not matched with fuel type