Abstract: A bell type annealing furnace structure that includes a base which has a base plate member and an annular channel therearound. A plurality of circumferentially spaced enclosure members are provided, each having a coil support section with support legs depending therefrom supporting the enclosure member on the base plate member and defining a space between the base plate member and the coil support section. The enclosure members are configured to form a central annular opening, and joints interconnect each of the enclosure members. Each joint includes a web member extending between the adjacent enclosure members and is curved toward the base plate member. Reinforcing segments are disposed in the spaces between and engaging both the base plate member and the coil support section. A cap member is disposed in the annular opening defined by the enclosure members, and includes an upper section and an annular leg depending therefrom engaging the base plate member.