Question: what is the difference between direct vent and vent free gas fireplaces?
Answer: The Difference Between Vent-free and Direct Vent Fireplaces A direct vent fireplace uses a coaxial pipe system to draw combustion air from the outside through the outer pipe. The inner pipe vents the exhaust through the roof or outside wall. ... A vent-free fireplace operates without a chimney, or outside flues or vents.