Abstract: A coaxial pipe assembly for a direct vent fireplace coaxial flue-system. The coaxial pipe assembly has an inner flue pipe residing within an outer flue pipe where the two pipes are retained to one another. Each flue pipe has a male connector and a female connector with the male connector of the outer flue pipe being aligned with the female end of the inner flue pipe. Lances are formed into the female connector of the outer flue pipe and a locking ridge is formed into the male connector of the outer flue pipe. Each of the two flue pipes of a first coaxial pipe assembly is designed to engage their counterpart in an adjacent coaxial pipe assembly. This engagement seals the adjacent inner flue pipes and is fixed upon the locking ridge passing the lances of a first coaxial pipe assembly to snap into place.

Abstract: An artificial log assembly is disclosed. The artificial log assembly includes first and second concrete portions and a ceramic portion disposed between the first and second concrete portions. The concrete portions are easily and economically formed to an appearance of natural firewood, and the ceramic portion provides a "glowing effect" of burning embers when heated. Also disclosed is a log assembly system utilizing dual gas burners of different flame temperatures.

Abstract: A mechanical spacer for holding an inner pipe fixed in place within an encasing outer pipe in a multiple wall pipe assembly. The spacer functions in place of a bracket in a double wall-chimney pipe assembly. The unitary spacer requires no external hardware nor requires welding, screwing, riveting or the like step in the manufacturing or assembly of the pipe assembly.