The Regency Horizon line of gas inserts provides a contemporary styling choice to the gas fireplace insert category. The HRI4E is our most popular size gas insert and is able to fit in approximately 95% of existing fireplaces. Make the HRI4E gas insert your own with your choice of several contemporary faceplates, vignette inlays, and fireplace media. As with all of Regency's gas inserts, the HRI4E comes with a fan to help circulate warm air and heat a larger area.