An all-plastic light duty shelf unit includes rectangular shelf modules and vertical spacers. Each shelf module has four corner joints that can either be mated directly with each other or coupled together using cylindrical vertical spacers. This allows the user to customize the configuration of the shelf unit to meet his or her specific needs. It also reduces the cost to manufacture the shelf unit because the vertical spacers can be extruded rather than injection-molded. The corner joints also hold a shelf off the floor, thereby reducing part count and manufacturing cost.
A furnace furniture system comprises multiple shelves supported by a multiplicity of legs, each shelf having multiple openings therethrough. Each leg comprises: (i) at least one modular body having a bottom recess and a top protrusion, the top protrusion adapted to extend through an opening in the shelf and the first protrusion is also adapted to fit within the bottom recess of another leg body; (ii) at least one cap/foot component having a top protrusion that is similar to the leg body top protrusion; and, (iii) means to secure a cap/foot component to an adjacent cap/foot component or leg body; wherein at least one leg comprises a cap/foot component secured to either a first protrusion or a second protrusion extending through an opening in the first shelf and wherein at least one leg comprises a cap/foot component secured to either a first protrusion or a second protrusion extending through an opening in the second shelf. The furnace furniture may also comprise ceramic components to isolate work pieces from contact with the shelves and/or legs. Additionally, the furniture may include ceramic survey rings.