| F | SK | MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING |
| F23 | KL | COMBUSTION APPARATUS; COMBUSTION PROCESSES |
| F23M | UKL | CONSTRUCTIONAL DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR (construction or support of tube walls for steam boilers F22B; generating combustion products of high pressure or high velocity F23R) |
| F23M 3/00 | HGR | Firebridges (baffles not confining the fire F23M 9/06) |
| F23M 3/02 | UGR1 | | . | modified for circulation of fluids, e.g. air, steam, water |
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| F23M 3/04 | UGR2 | | . . | for delivery of gas, e.g. air, steam |
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| F23M 3/06 | UGR3 | | . . . | into or towards fire |
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| F23M 3/08 | UGR3 | | . . . | away from fire, e.g. towards smoke outlet |
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| F23M 3/10 | UGR3 | |
| F23M 3/12 | UGR1 | | . | characterised by shape or construction (F23M 3/02 takes precedence) |
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| F23M 3/14 | UGR2 | | . . | with apertures for passage of combustion products |
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| F23M 3/16 | UGR2 | | . . | built-up in sections, e.g. using bars or blocks |
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| F23M 3/18 | UGR2 | |
| F23M 3/20 | UGR2 | | . . | comprising loose refractory material, wholly or in part |
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| F23M 3/22 | UGR1 | |
| F23M 5/00 | HGR | Casings; Linings; Walls (casings, linings, or walls of heat-treatment chambers of ovens, kilns, or retorts F27D) |
| F23M 5/02 | UGR1 | | . | characterised by the shape of the bricks or blocks used (ceramic materials C04B 33/00 , C04B 35/00) |
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| F23M 5/04 | UGR1 | |
| F23M 5/06 | UGR1 | |
| F23M 5/08 | UGR1 | | . | Cooling thereof; Tube walls |
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| F23M 7/00 | HGR | Doors specially adapted for combustion chambers (in general E06B; for flues or smoke-boxes F23J 13/08) |
| F23M 7/02 | UGR1 | |
| F23M 7/04 | UGR1 | | . | Cooling doors or door frames |
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| F23M 9/00 | HGR | Baffles or deflectors for air or combustion products; Flame shields |
| F23M 9/02 | UGR1 | |
| F23M 9/04 | UGR1 | | . | with air-supply passages in the baffle or shield |
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| F23M 9/06 | UGR1 | |
| F23M 9/08 | UGR1 | | . | Helical or twisted baffles or deflectors |
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| F23M 9/10 | UGR1 | | . | Baffles or deflectors formed as tubes, e.g. in water-tube boilers (interconnection of such tubes in boilers for fluid flow F22) |
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| F23M 11/00 | HGR | Safety arrangements (by controlling combustion F23N 5/24) |
| F23M 11/02 | UGR1 | | . | Preventing emission of flames or hot gases, or admission of air, through working or charging apertures |
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| F23M 11/04 | UGR1 | | . | Means for supervising combustion, e.g. window (alarm systems G08B) |
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| F23M 13/00 | HGR | Other details [3] |