Superior WCT6920 22" EPA Certified Traditional Wood Burning Fireplace With White Stacked Refractory Panels h25.46 Model 5MO12 Application For use standard Model 5MO12 Application For use with category I natural gas burning or propane fired appliances such as gas boilers Created using an incredibly durable cast refractory construction method Firebox Interior Height 11 3 4" Firebox Interior Depth* 12" Interior Cubic Feet 2 This 20 Year Limited Warranty applies only if the Product is installed in the United States or Canada and only if operated and maintained in accordance with the printed instructions accompanying the Product and in compliance with all applicable installation and building codes and good trade practices