What is the minimum thickness for the back and side walls of a firebox if using 2-inch fire brick lining?

The minimum thickness for the back and side walls of a firebox using a 2-inch fire brick lining is 8 inches. This requirement is based on maintaining structural integrity and ensuring adequate thermal resistance in the firebox. Fire bricks are designed to withstand high temperatures and provide excellent insulation properties. However, the overall wall thickness must also account for additional materials or components that may be involved in the construction to ensure safety and compliance with building codes.

In this scenario, 8 inches of thickness is specified to allow for a combination of the fire brick lining and any additional material needed to adequately insulate the structure from heat and prevent potential hazards, such as cracking or thermal bridging. This standard ensures that the firebox operates safely and efficiently, minimizing the risk of fire hazards while also meeting performance guidelines established within relevant building codes.