What was the term for the masonry work surrounding the furnace in older boilers?

The term for the masonry work surrounding the furnace in older boilers is referred to as the boiler setting. This structure supports the boiler components and helps to contain the heat generated by the combustion process. The boiler setting is essential for safe operation and efficiency, as it insulates the boiler from the surrounding environment and directs heat into the boiler itself.

In older boiler designs, the setting often consisted of brick or masonry materials that provided durability and fire resistance. This was particularly important given the high temperatures involved in boiler operation. The setting also contributes to the overall stability and safety of the boiler installation, ensuring that it can withstand the thermal stresses experienced during operation.

Other terms, such as boiler casing or firebox, may describe different components or features within a boiler system, but they do not specifically refer to the masonry work surrounding the furnace, which is why boiler setting is the precise term in this context.