I made change to my home today. I had the gas disconnected and put a plastic panel over the fireplace inside the surround and put an extractor fan where the fire hole was.
This increases the flow of air by blowing air out of the chimney and in from the two ventilators in the wall up stairs.
This makes for ventilation without draft.
My dining room with my new arrangement.
I am planning to buy a television to put in the space.