| F | SK | SECTION F — MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING |
| F23 | KL | COMBUSTION APPARATUS; COMBUSTION PROCESSES |
| F23N | UKL | REGULATING OR CONTROLLING COMBUSTION (control devices specially adapted for combustion apparatus in which combustion takes place in a fluidised bed of fuel or other particles F23C 10/28; condition responsive controls for regulating combustion in domestic stoves with open fires for solid fuel F24B 1/187) |
| F23N 1/00 | HGR | Regulating fuel supply |
| F23N 1/02 | UGR1 | | . | conjointly with air supply |
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| F23N 1/04 | UGR1 | | . | conjointly with air supply and with draught |
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| F23N 1/06 | UGR1 | |
| F23N 1/08 | UGR1 | | . | conjointly with another medium, e.g. boiler water |
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| F23N 1/10 | UGR2 | | . . | and with air supply or draught |
|
| F23N 3/00 | HGR | Regulating air supply or draught (conjointly with fuel supply F23N 1/00) |
| F23N 3/02 | UGR1 | | . | Regulating draught by direct pressure operation of single valves or dampers |
|
| F23N 3/04 | UGR1 | | . | by operation of single valves or dampers by temperature-sensitive elements |
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| F23N 3/06 | UGR1 | | . | by conjoint operation of two or more valves or dampers (F23N 3/08 takes precedence) |
|
| F23N 3/08 | UGR1 | | . | by power-assisted systems |
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| F23N 5/00 | HGR | Systems for controlling combustion (F23N 1/00, F23N 3/00 take precedence) |
| F23N 5/02 | UGR1 | | . | using devices responsive to thermal changes or to thermal expansion of a medium |
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| F23N 5/04 | UGR2 | | . . | using bimetallic elements |
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| F23N 5/06 | UGR2 | | . . | using bellows; using diaphragms |
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| F23N 5/08 | UGR2 | | . . | using light-sensitive elements |
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| F23N 5/10 | UGR2 | |
| F23N 5/12 | UGR2 | | . . | using ionisation-sensitive elements, i.e. flame rods |
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| F23N 5/14 | UGR2 | | . . | using thermo-sensitive resistors |
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| F23N 5/16 | UGR1 | | . | using noise-sensitive detectors |
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| F23N 5/18 | UGR1 | | . | using detectors sensitive to rate of flow of air or fuel |
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| F23N 5/20 | UGR1 | | . | with a time programme acting through electrical means, e.g. using time-delay relays |
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| F23N 5/22 | UGR1 | | . | with a time programme acting through mechanical means, e.g. using cams |
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| F23N 5/24 | UGR1 | | . | Preventing development of abnormal or undesired conditions, i.e. safety arrangements (F23N 5/02-F23N 5/18 take precedence) |
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| F23N 5/26 | UGR1 | |