Works in conjunction with your existing furnace and HVAC (heating, ventilation & air conditioning) duct work to heat your entire home, while drastically reducing home heating costs. Heats up to 2500 sq. ft. with an output of 52,300 to 139,000 BTU/hr. Heavy- gauge, 2-piece firebox with heavy-duty cast-iron feed and ash doors. Separate ash door with removable dump pan. Twin 550 CFM blowers. Large capacity firebox has firebrick lining for up to 8 hours average heating output on 1 fuel loading. Twin cast-iron grates provide ample surface area for combustion of coal. Extra heavy-duty cast-iron doors, grates, and liners are removeable and replaceable. Shaker grates with handle included. Heavy-duty cast-iron front and rear liners protect firebox ends and help distribute heat evenly. Raised and tapered heat outlet allows for secure connection of 8" heat ducts. Front mounted smoke curtain reduces smoke spillage during refueling. Overall size approximately: 40.25" H. x 40" D. (without blower; 53.5" with blower) and 24.25" W. Clearance to combustibles 9" on sides and 48" in front. Smoke pipe outlet is 6". Firebox dimensions approximately: 19-1/2" H. x 20" W. x 30-1/2" D.