A fireplace glass door is installed on a fireplace to keep the room warm longer when the flames die down. Whether a wood burning fireplace or a gas burning fireplace, heat radiated into the room escapes through the chimney. One does not notice this while the fire is burning brightly, because of the heat from the flames that radiates into the room. However, when the fire starts to die down, the hearth becomes cold quickly as the heat escapes through the fireplace opening. To stop this from happening, a fireplace glass doors blocks the opening, keeping the warm air from leaving the room.
A modern fireplace can be categorized as such because of the latest technology that facilitates its operation. A natural wood burning fireplace can be converted into a modern type ignited by natural gas, propane or electricity. There are also modern eco-friendly ventless fireplaces fueled by bio-ethanol which do not have any smoke emission. Bio-ethanol combustion produces heat together with a tiny amount of water vapor and steam. This method eliminates the need for a chimney or flue. Technologically advanced features and futuristic design make up a modern fireplace.