The G4 gas insert is designed to fit existing large fireplace openings without sacrificing presence or performance. The result is an impressive flame viewing area highlighted by a proportional surround that compliments, not overpowers. Increase your overall home efficiency while providing ease-of-use heat controls and effective warmth distribution. Ceramic and stainless steel burner kit options are engineered for performance and efficiency. Valor inserts provide peak performance and improved operating efficiencies—saving you energy with AutoFire™.