This unit is made with a firebrick lined plate steel firebox surrounded by a black painted insulated steel cabinet. Connection to your existing ductwork is easy with the 13 x 18 heat outlet. Works with your existing HVAC ductwork. Available accessories include the universal filter box kit and hot water coil kit.Up to 180,000 BTU's Up to 3,000 sq. ft. Up to 28 inch log length Up to 160lb. coal capacity Twin 800 CFM blowersDepth: 54 Height: 51 Weight: 525 lbs Width: 24-1 2