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1. [special compound metal]’s cast-iron ware(15mm) of brick pattern + [airflow leading plate]=[guideboard of soot-removal] at the upper & lower side of entrance in the fire box (patent commodity)
2. [double install] safe enough for high heat (safe when touch with covering at surface)
3. air tank way – micro hole in the fire box and air-backboard + passageway pipe of outside-air (control choosing freely inside-air or outside-air)
4. air conditioning system near the ashpan – simple and excellent
5. multiplex cubic jet method of the ignition at the back in the fire box (the fire starts from the back in the fire box) + install oven cask for sweet potatoes & damper control device

6. patent of the air-curtain device (clean line and company logo at the ceramic glass) - - It is the beginning of the fireplace, which is unharmful to human bodies, that have not [the isolation-curtain](the asbestos-plate, the glass fiber-plate, that is harmful to human bodies ) in an interval between fireplace body and glass door.
It is the best fireplace in the present time, that get rid of air pollution epochally.

7. burning time – over 12 hours (remained charcoal fire from the burning beginning ~ when closed air supply install)
8. heat output per unit of hour(calorific value) : about 13,500kcal/hr (1BTU=0.252kcal)(0.293BTU/hr = Watt)(860cal=1w)
9. triple chimney(stovepipe) diameter : single chimney 170Ø(mm), dual chimney caliber 210Ø outside diameter 270Ø