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.
Gas fireplace doors open or closed for heat.
It is still an open hearth fireplace which is susceptible to aerodynamics.
Open no glass doors like isokern or firerock with add on gas burning unit fake ceramic logs.
This results in a dull blaze with little heat output.
99 of the time your fireplace doors should be open when you are burning a fire.
If your fireplace doors are shut oxygen cannot reach the flames.
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.
Compatible with a traditional masonry fireplace the decorative compatible with a traditional masonry fireplace the decorative and bi fold pleasant hearth ascot collection glass fireplace doors have a 1 piece welded frame and a high heat powder coated black finish.
In the off chance you have.
All gas logs should be burned with the doors wide open even if a mfr tells you they are approved for closed doors.
If you close the doors the flames pull towards the glass where it can impinge and shatter the glass.