Ashley Coal Circulator with cast-iron duplex shaker grates. Extra large ash drawer makes maintenace easier. Positive door latch prevents accidental door opening. Cast-iron ash and feed doors with ceramic fiber gaskets ensure an airtight seal. Hinged lift-up great for cooking. Heat output is 48,000 BTUs/hr. heating capacity of 1,200 sq.ft. This coal burning stove has a 6" flue collar and can handle up to 70 lbs of coal.