| F | SK | MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING |
| F23 | KL | COMBUSTION APPARATUS; COMBUSTION PROCESSES |
| F23L | UKL | AIR SUPPLY; DRAUGHT-INDUCING; SUPPLYING NON-COMBUSTIBLE LIQUID OR GAS (air-supply arrangements for combustion apparatus using fluent fuel, e.g. fluidised bed combustion apparatus, F23C; dampers or throat restrictors for open fire-places F24; air inlet valves for open fire fronts F24) |
| F23L 1/00 | HGR | Passages or apertures for delivering primary air for combustion |
| F23L 1/02 | UGR1 | | . | by discharging the air below the fire |
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| F23L 3/00 | HGR | Arrangements of valves or dampers before the fire |
| F23L 5/00 | HGR | Blast-producing apparatus before the fire |
| F23L 5/02 | UGR1 | | . | Arrangements of fans or blowers (fans or blowers per se F04) |
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| F23L 5/04 | UGR1 | | . | by induction of air for combustion, e.g. using steam jet |
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| F23L 7/00 | HGR | Supplying non-combustible liquids or gases, other than air, to the fire, e.g. oxygen, steam |
| F23L 9/00 | HGR | Passages or apertures for delivering secondary air for completing combustion of fuel |
| F23L 9/02 | UGR1 | | . | by discharging the air above the fire |
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| F23L 9/04 | UGR1 | | . | by discharging the air beyond the fire, i.e. nearer the smoke outlet |
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| F23L 9/06 | UGR1 | | . | by discharging the air into the fire bed |
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| F23L 11/00 | HGR | Arrangements of valves or dampers after the fire |
| F23L 11/02 | UGR1 | | . | for reducing draught by admission of air to flues |
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| F23L 13/00 | HGR | Construction of valves or dampers for controlling air supply or draught (in general F16K) |
| F23L 13/02 | UGR1 | | . | pivoted about a single axis but having no other movement (formed as linked slats each pivoted about an axis F23L 13/08) |
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| F23L 13/04 | UGR2 | | . . | with axis perpendicular to face |
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| F23L 13/06 | UGR1 | |
| F23L 13/08 | UGR1 | | . | operating as a roller blind; operating as a venetian blind |
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| F23L 13/10 | UGR1 | | . | having a compound movement involving both sliding and pivoting |
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| F23L 15/00 | HGR | Heating of air supplied for combustion |
| F23L 15/02 | UGR1 | | . | Arrangements of regenerators |
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| F23L 15/04 | UGR1 | | . | Arrangements of recuperators |
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| F23L 17/00 | HGR | Inducing draught |
| F23L 17/02 | UGR1 | | . | Tops for chimneys or ventilating shafts; Terminals for flues |
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| F23L 17/04 | UGR2 | | . . | Balanced-flue arrangements, i.e. devices which combine air inlet to combustion unit with smoke outlet |
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| F23L 17/06 | UGR2 | |
| F23L 17/08 | UGR2 | | . . | with coaxial cones or louvres |
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| F23L 17/10 | UGR2 | | . . | wherein the top moves as a whole |
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| F23L 17/12 | UGR2 | | . . | Devices for fastening the top or terminal to chimney, shaft, or flue |
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| F23L 17/14 | UGR2 | |
| F23L 17/16 | UGR1 | | . | Induction apparatus, e.g. steam jet, acting on combustion products beyond the fire |
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