The Comelt furnace is an EAF on a DC basis with side electrodes provided by VAI. In most cases the furnace is featured with four slanted electrodes. It results in electric energy transmission by four inclined DC arcs. The essential advantages are: high productivity (tap-to-tap times of less than 45 min), reduction of total energy consumption, reduction of electrode consumption (approximately 30%), complete off gas collection at all times and a reduction of off gas volume by up to 70%, reduction in maintenance costs due to a simpler plant design, reduced noise level by up to 15 dB(A) (Worrell et al., 2010. p. 93)