Is a Vented or Vent-free gas fireplace? I really suspect it's Vent-free (ventless) as a vented unit, unless the direct vent is clogged exhaust everything, including 85% of the heat out side.
Here are the things that will cause a Vent-free Gas Fireplace to soot.
- Not having the fireplace cleaned and serviced, at least annually by a qualified technician.
- Misplaced logs that impinge the main burner flames.
- Running a ceiling fan at the wrong speed and in the wrong direction while fireplace is burning.
- Burning scented candles while burning the fireplace.
- Low Gas Pressure to the burner.
Here are the solutions to the above listed causes:
- Have the fireplace cleaned and serviced.
- Check your Owners Manual concerning the proper placement of each log,
- Run the ceiling fan Counter Clockwise and at the slowest speed. The fan on the side of the switch should be in the UP position for Winter and Down for Summer.
- Scented candles soot any way. Add the warm moist heat of the Gas Fireplace and they'll soot 50 times worse. The scent is not natural, it has an alcohol base like after shave & cologne. Stop burning scented candles. It has been proven that they greatly contribute to indoor air pollution.
- Low gas pressure causes incomplete combustion, which causes the burner to soot. Have it checked by your propane provider.
Based on my 15 years in the hearth and home business and having sold and installed hundreds of these appliances, I am will to bet, it's a cleaning and servicing issue or misplaced logs.
Hope this helps you solve your sooting problem. I woud really like to know how it works out for you.
Please let me know at firstname.lastname@example.org
Thanks ... Rich