| 1/00 | Shaft or like vertical or substantially vertical furnaces (for preheating, burning, calcining or cooling lime, magnesia or dolomite C04B 2/12) |
| 1/02 | Shaft or like vertical or substantially vertical furnaces (for preheating, burning, calcining or cooling lime, magnesia or dolomite C04B 2/12) with two or more shafts or chambers, e.g. multi-storey |
| 1/04 | Shaft or like vertical or substantially vertical furnaces (for preheating, burning, calcining or cooling lime, magnesia or dolomite C04B 2/12) with two or more shafts or chambers, e.g. multi-storey Combinations or arrangements of shafts |
| 1/06 | Shaft or like vertical or substantially vertical furnaces (for preheating, burning, calcining or cooling lime, magnesia or dolomite C04B 2/12) of other than up-draught type |
| 1/08 | Shaft or like vertical or substantially vertical furnaces (for preheating, burning, calcining or cooling lime, magnesia or dolomite C04B 2/12) heated otherwise than by solid fuel mixed with charge |
| 1/09 | Shaft or like vertical or substantially vertical furnaces (for preheating, burning, calcining or cooling lime, magnesia or dolomite C04B 2/12) heated otherwise than by solid fuel mixed with charge heated electrically |
| 1/10 | Shaft or like vertical or substantially vertical furnaces (for preheating, burning, calcining or cooling lime, magnesia or dolomite C04B 2/12) Details, accessories, or equipment peculiar to furnaces of these types |
| 1/12 | Shaft or like vertical or substantially vertical furnaces (for preheating, burning, calcining or cooling lime, magnesia or dolomite C04B 2/12) Details, accessories, or equipment peculiar to furnaces of these types Shells or casings; Supports therefor |
| 1/14 | Shaft or like vertical or substantially vertical furnaces (for preheating, burning, calcining or cooling lime, magnesia or dolomite C04B 2/12) Details, accessories, or equipment peculiar to furnaces of these types Shells or casings; Supports therefor Arrangements of linings (linings in general F27D 1/00) |
| 1/16 | Shaft or like vertical or substantially vertical furnaces (for preheating, burning, calcining or cooling lime, magnesia or dolomite C04B 2/12) Details, accessories, or equipment peculiar to furnaces of these types Arrangements of tuyères |
| 1/18 | Shaft or like vertical or substantially vertical furnaces (for preheating, burning, calcining or cooling lime, magnesia or dolomite C04B 2/12) Details, accessories, or equipment peculiar to furnaces of these types Arrangements of dust collectors |
| 1/20 | Shaft or like vertical or substantially vertical furnaces (for preheating, burning, calcining or cooling lime, magnesia or dolomite C04B 2/12) Details, accessories, or equipment peculiar to furnaces of these types Arrangement of devices for charging |
| 1/21 | Shaft or like vertical or substantially vertical furnaces (for preheating, burning, calcining or cooling lime, magnesia or dolomite C04B 2/12) Details, accessories, or equipment peculiar to furnaces of these types Arrangement of devices for discharging |
| 1/22 | Shaft or like vertical or substantially vertical furnaces (for preheating, burning, calcining or cooling lime, magnesia or dolomite C04B 2/12) Details, accessories, or equipment peculiar to furnaces of these types Arrangements of heat-exchange apparatus (heat-exchangers in general F28C, F28D) |
| 1/24 | Shaft or like vertical or substantially vertical furnaces (for preheating, burning, calcining or cooling lime, magnesia or dolomite C04B 2/12) Details, accessories, or equipment peculiar to furnaces of these types Cooling arrangements |
| 1/26 | Shaft or like vertical or substantially vertical furnaces (for preheating, burning, calcining or cooling lime, magnesia or dolomite C04B 2/12) Details, accessories, or equipment peculiar to furnaces of these types Arrangements of controlling devices |
| 1/28 | Shaft or like vertical or substantially vertical furnaces (for preheating, burning, calcining or cooling lime, magnesia or dolomite C04B 2/12) Details, accessories, or equipment peculiar to furnaces of these types Arrangements of monitoring devices, of indicators, of alarm devices |
| 3/00 | Hearth-type furnaces, e.g. of reverberatory type (F27B 9/00-F27B 15/00, F27B 21/00 take precedence); Electric arc furnaces |
| 3/02 | Hearth-type furnaces, e.g. of reverberatory type (F27B 9/00-F27B 15/00, F27B 21/00 take precedence); Electric arc furnaces of single-chamber fixed-hearth type |
| 3/04 | Hearth-type furnaces, e.g. of reverberatory type (F27B 9/00-F27B 15/00, F27B 21/00 take precedence); Electric arc furnaces of multiple-hearth type; of multiple-chamber type; Combinations of hearth-type furnaces |