Hearth-type furnaces, e.g. of reverberatory type (F27B9/00, F27B11/00, F27B13/00, F27B14/00, F27B15/00, F27B21/00 take precedence); Electric arc furnaces

Child Classifications

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• F27B 3/002
• F27B 3/02 of single-chamber fixed-hearth type
• F27B 3/04 of multiple-hearth type; of multiple-chamber type; Combinations of hearth-type furnaces
• F27B 3/06 with movable working chambers or hearths, e.g. tiltable
• F27B 3/08 heated electrically, with or without any other source of heat
• F27B 3/10 Details, accessories or equipment, e.g. dust-collectors, specially adapted for hearth-type furnaces