Abstract: A lightweight, prefabricated, modular masonry fireplace. The firebox is pre-cast in modular sections of lightweight vermiculate concrete. A kiva-style version of the fireplace features a modular firebox disposed within an outer facade made from a tubular steel frame, covered with metal-mesh stuccoed and plastered to present the aesthetic configuration of a sculpted adobe fireplace. An alternative, but equally desirable Rumford-style version of the fireplace does not require an outer facade, but also is assembled from lightweight modular sections. The firebox of all embodiments is cast in modular sections. A central body section of the firebox is placed upon a base, and a smoke plenum section is placed upon the central body section. The central body section, and in some embodiments a portion of the smoke plenum section, define and mostly surround the combustion chamber.

Abstract: A lightweight prefabricated masonry/steel kiva-style fireplace. The firebox is cast in three or more modular sections. The entire inner combustion chamber is lined with split refractory firebrick and an outer shell is lightweight vermiculite concrete. The center firebox section has a semi-circular concave interior and the tubular steel and mesh exterior kiva fireplace stuccoed and plastered frame facade has a semi-circular convex exterior configuration with the appearance of a sculpted adobe fireplace. The firebox damper/anchor plate provides a transition from the masonry firebox to a double-walled chimney system. The firebox can be placed in a room comer or in a chase on a flat wall. It can also be installed over wood floors, in old or new construction.