This new Paragon Janus-series kiln can fire both POTTERY and GLASS because heating elements are mounted in both the top and sidewalls! Select between glass and pottery with the flip of a switch. With the switch in the glass position, heat comes from the top elements and the middle sidewall element. With the switch in the pottery position, heat comes from only the sidewall elements. In the glass mode, fuse and sag large glass projects placed on a single shelf. In the pottery mode, fire to cone 10 (2350°F). You can also fire several shelves of smaller glass pieces using the pottery mode. The elements in the lid/roof are mounted in a firebrick "ball” groove that eliminates element pins. The element coils are wider than the groove opening, so the elements stay in place without pins. The groove dissipates heat efficiently. The lid on the Janus-27 top-loading kiln is easy to lift with the exclusive, patented Paragon spring counter-balance.