Open no glass doors like isokern or firerock with add on gas burning unit fake ceramic logs.
Gas fireplace doors open or closed for heat.
All gas logs should be burned with the doors wide open even if a mfr tells you they are approved for closed doors.
It is still an open hearth fireplace which is susceptible to aerodynamics.
Oxygen is a key element in healthy burning fires.
Allowing your fireplace doors to remain open will promote better airflow.
99 of the time your fireplace doors should be open when you are burning a fire.
Ceramic glass doors a masonry fireplace and do not care about any heat coming into your room then it is ok to burn a fire with your glass doors closed.
Large 10 class a metal chimney required hefty 1000 lbs of masonry firebox unsealed good radiant heat and open to the room no fans or accessory heat ducts.
Designed as a surface mount these track free doors sit outside the fireplace opening against a flat surface and help reduce.
In the off chance you have.
This results in a dull blaze with little heat output.