F23LSUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL  air-supply arrangements for fluent fuels F23C; firebridges with means for feeding air or steam F23M3/04; baffles or shields with air supply passages F23M9/04VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS dampers and throat restrictors for open fire-places F24; air inlet valves for open fire fronts F24INDUCING DRAUGHT IN COMBUSTION APPARATUSTOPS FOR CHIMNEYS OR VENTILATING SHAFTSTERMINALS FOR FLUESIn this subclass non-limiting references (in the sense of paragraph 39 of the Guide to the IPC) may still be displayed in the scheme. F23L1/00 F23L1/00Passages or apertures for delivering primary air for combustion  baffles or deflectors in air inlets F23M9/02 F23L1/02by discharging the air below the fire F23L3/00Arrangements of valves or dampers before the fire F23L5/00Blast-producing apparatus before the fire F23L5/02Arrangements of fans or blowers F23L5/04by induction of air for combustion, e.g. using steam jet F23L7/00Supplying non-combustible liquids or gases, other than air, to the fire, e.g. oxygen, steam F23L7/002Supplying water F23L7/005Evaporated water; Steam F23L7/007Supplying oxygen or oxygen-enriched air F23L9/00Passages or apertures for delivering secondary air for completing combustion of fuel  baffles or deflectors in air inlets F23M9/02 F23L9/02by discharging the air above the fire F23L9/04by discharging the air beyond the fire, i.e. nearer the smoke outlet F23L9/06by discharging the air into the fire bed F23L11/00Arrangements of valves or dampers after the fire F23L11/005for closing the flue during interruption of burner function F23L11/02for reducing draught by admission of air to flues F23L13/00Construction of valves or dampers for controlling air supply or draught F23L13/02pivoted about a single axis but having not other movement formed as linked slats each pivoted about an axis F23L13/08 F23L13/04with axis perpendicular to face F23L13/06slidable only F23L13/08operating as a roller blindoperating as a venetian blind F23L13/10having a compound movement involving both sliding and pivoting F23L15/00Heating of air supplied for combustion F23L15/02Arrangements of regenerators F23L15/04Arrangements of recuperators F23L15/045using intermediate heat-transfer fluids F23L17/00Inducing draughtTops for chimneys or ventilating shaftsTerminals for flues F23L17/005using fans F23L17/02Tops for chimneys or ventilating shaftsTerminals for flues F23L17/04Balanced-flue arrangements, i.e. devices which combine air inlet to combustion unit with smoke outlet F23L17/06branchedT-headed F23L17/08with coaxial cones or louvres F23L17/10wherein the top moves as a whole F23L17/12Devices for fastening the top or terminal to chimney, shaft, or flue F23L17/14Draining devices F23L17/16Induction apparatus, e.g. steam jet, acting on combustion products beyond the fire F23L99/00Subject matter not provided for in other groups of this subclass F23L2700/00 F23L2700/00Installations for increasing draught in chimneysSpecific draught control devices for locomotives F23L2700/001Installations for increasing draught in chimneys F23L2700/002Specific draught control devices for locomotives F23L2900/00Special arrangements for supplying or treating air or oxidant for combustionInjecting inert gas, water or steam into the combustion chamber F23L2900/00001Treating oxidant before combustion, e.g. by adding a catalyst F23L2900/05021Gas turbine driven blowers for supplying combustion air or oxidant, i.e. turbochargers F23L2900/07001Injecting synthetic air, i.e. a combustion supporting mixture made of pure oxygen and an inert gas, e.g. nitrogen or recycled fumes F23L2900/07002Injecting inert gas, other than steam or evaporated water, into the combustion chambers F23L2900/07003Controlling the inert gas supply F23L2900/07004Injecting liquid or solid materials releasing oxygen, e.g. perchlorate, nitrate, peroxide, and chlorate compounds, or appropriate mixtures thereof F23L2900/07005Injecting pure oxygen or oxygen enriched air F23L2900/07006Control of the oxygen supply F23L2900/07007using specific ranges of oxygen percentage F23L2900/07008Injection of water into the combustion chamber F23L2900/07009Injection of steam into the combustion chamber F23L2900/15021using regenerative heat exchanger bodies with different layers of material F23L2900/15022using pre-purging regenerator beds F23L2900/15041Preheating combustion air by recuperating heat from ashes F23L2900/15042Preheating combustion air by auxiliary combustion, e.g. in a turbine F23L2900/15043Preheating combustion air by heat recovery means located in the chimney, e.g. for home heating devices F23L2900/15044Preheating combustion air by heat recovery means using solar or other clean energy