Monessen Hearth is an environmentally conscious company that takes pride in its manufacturing! Since 1993, they have been heading up the fireplace industry with their ventless gas fireplaces and heat stoves. Boasting a 99.9% efficiency, you'll appreciate how Monessen vent free fireplaces will deliver unbeatable performance while helping the planet and still be cost-effective. Styles range from decorative, and traditional, to linear and modern. They test all of their products before they leave the factory to ensure the products work and work safely with no gas leaks.