The 4099 V Series is designed for tempering, annealing, stress relieving, shrink fitting and heat treating large workloads to 1400¿F (760¿C). They are equipped with a high CFM stainless steel fan for recirculation. The fan assembly is roof mounted, providing a vertical airflow pattern and uniform temperature throughout the chamber. The heating elements are located on both side walls and feature heavy gage low watt density wire coils mounted individually on ceramic rods. The interior of the chamber is lined with a multi-layer combination of lightweight firebrick and block insulation to minimize heat loss.