Toughness bottom line

Cabin fired heaters inciude a tough metai sheii that surrounds a firebox, convection section, and stack. Cyiindricai furnaces use a tube-shaped firebox to transfer heat energy into a moving liquid. A box furnace has the same standard components as a cabin furnace. The burners can be arranged on the bottom or on the sidewaii. The tube arrangement depends on how the burners line up. 

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