The TNF24 with Sentry 12-Key Controller is a round, top loading Insulating 2.5″ FireBrick Kiln with groove mounted Elements. It measures 23.5″dia x 29.00″D inside. The TNF24 Kiln is rated to 2300°F. It fires on 240 Volt / 1 Phase and has a NEMA 6-50P cordset. Drop Down Switchbox. Rated to10982 Watts.