Unbranded Fireplaces - Vent-Free Gas Fireplace is a safe and efficient way to heat your home. Vent-free fireplaces do not require a chimney, making them easy to install in any room of your house. They also produce a lot of heat, making them a great way to warm up on a cold day. With their realistic flame and log set, vent-free gas fireplaces can also add a touch of ambiance to your home and give the impression of a real wood-burning fireplace.