Low Flame - too much primary air.

Close down the air shutter in small increments, replacing the window and letting fireplace operate for at least 10 minutes after each adjustment.

Also: Check that the the restrictor plate has been installed on vertically vented DV's. Check that flue baffle the restrictor has been installed on vertically vented cast iron stoves and DVR33.

Tall Orange Flame : not enough combustion air. Tall lazy flames that become dark yellow or orange in color, or flames that impinge on the top of the firebox will cause sooting. Both conditions are symptoms of lack of combustion air. Open up the primary air shutter(s).

Also: Check the venting. Ensure that natural and direct vents are installed properly as per the installation manual.

Check the log set up.

Check that flue baffle restrictor has not been used on sidewall cast stoves or DVR33.

Ghosting Flame : lack of combustion air. Wispy, transparent blue flames that lift off the burner and float through the firebox looking for oxygen. Fireplace will only run for a short time before it shuts itself down. Typically due to poor draft or flue gas recirculation. With NV's introduce make-up air, check for flue blockage. With DV's check venting, termination location, ensure all insulation has been removed when converting a rear to a top vent, and ensure there are no firebox leaks.

Noisy Flame : Excess primary air. Gas/ air mixture ignites close to orifice and sounds like a blowtorch. Also called flashback. Will cause soot deposits at the orifice/ primary air shutter. Clean and adjust the primary air shutter as per 'low flame' above.

Also: Reduce the amount of ceramic ember materials on the front of the radiant burner.