Cross over duct for heating walls of a coke oven or coke oven battery

A cross over duct configured to fluidly connect a first heating wall and a second heating wall in a coke oven, the cross over duct comprising:

• a first section having a first internal surface and a second internal surface being perpendicularly arranged, the first section having a first external surface and a second external surface being perpendicularly arranged, the first section having a first side and a second side, the first section having a first channel disposed therein, the first channel defined by a first aperture disposed within the first internal surface and a second aperture disposed within the second internal surface, the first section having a protruding section extending from the second internal surface, the protruding section arranged within respective peripheral edges of the first internal surface, the sides, and the first external surface, the second aperture being disposed within the protruding section;
• and,
• a second section having a first internal surface and a second internal surface being perpendicularly arranged, the second section having a first external surface and a second external surface being perpendicularly arranged, the second section having a first side and a second side, the second section having a second channel disposed therein, the second channel defined by a first aperture disposed within the first internal surface and a second aperture disposed within the second internal surface, the second section having a recessed section disposed with the second internal surface, the recessed section arranged within respective peripheral edges of the first internal surface, the sides, and the first external surface of the second section, the second aperture of the second channel being disposed within the recessed section, wherein:
• the protruding section is arranged to be at least partially seated within the recessed section thereby fluidly connecting the first and second channels to form a passageway between the first aperture of the first section and the first aperture of the second section.