|  | F |
SECTION F — MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING

LIGHTING AND HEATING

|  | F23 |
COMBUSTION APPARATUS; COMBUSTION PROCESSES

|  | F23 |
Note(s) In this class, the following terms are used with the meanings indicated: "Combustion" means the direct combination of oxygen gas, e.g. in air, and a burnable substance. Any other heat-producing combination of chemical substances, e.g. hydrogen peroxide and methane, iron oxide and aluminium, is provided for in Section C or in sub-class Fulltext... Hierarchy... Expanded...F24J. "Combustion chamber" means a chamber in which fuel is burned to establish a self-supporting fire or flame and which surrounds that fire or flame. "Burner" means a device by which fluent fuel is passed to a combustion space where it burns to produce a self-supporting flame. "Air" means a mixture of gases containing free oxygen and able to promote or support combustion.

|  | F23B |
COMBUSTION APPARATUS USING ONLY SOLID FUEL (for lump and another kind of fuel simultaneously or alternatively Fulltext... Hierarchy... Expanded...F23C 1/00; combustion in fluidised beds Fulltext... Hierarchy... Expanded...F23D 19/00; burning of low-grade fuel Fulltext... Hierarchy... Expanded...F23G; grates Fulltext... Hierarchy... Expanded...F23H; feeding solid fuel to combustion apparatus Fulltext... Hierarchy... Expanded...F23K; combustion chambers and details thereof Fulltext... Hierarchy... Expanded...F23M; domestic apparatus Fulltext... Hierarchy... Expanded...F24; central heating boilers Fulltext... Hierarchy... Expanded...F24D; package boilers Fulltext... Hierarchy... Expanded...F24H)

|  | F23B |
Note(s) This sub-class is only concerned with the combustion of lump fuel, or of pulverulent or granulated fuel if no use is made of its fluent nature.

|  | F23C |
COMBUSTION APPARATUS USING FLUENT FUEL (combustion apparatus for solid fuel only Fulltext... Hierarchy... Expanded...F23B; burners Fulltext... Hierarchy... Expanded...F23D; generating combustion products of high pressure or high velocity Fulltext... Hierarchy... Expanded...F23R)

|  | F23D |
BURNERS (generating combustion products of high pressure or high velocity Fulltext... Hierarchy... Expanded...F23R)

|  | F23G |
CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION

|  | F23G |
Note(s) This sub-class includes the burning of low-grade fuel of solid, liquid, or gaseous nature.

|  | F23H |
GRATES; CLEANING OR RAKING GRATES

|  | F23J |
REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES (precipitating dust from flue gases Fulltext... Hierarchy... Expanded...B01D; composition of fuels Fulltext... Hierarchy... Expanded...C10)

|  | F23J |
Note(s) This sub-class includes the cleaning of external surfaces of water tubes of boilers.

|  | F23K |
FEEDING FUEL TO COMBUSTION APPARATUS

|  | F23L |
AIR SUPPLY; DRAUGHT-INDUCING; SUPPLYING NON-COMBUSTIBLE LIQUID OR GAS (air-supply arrangements for fluent fuels Fulltext... Hierarchy... Expanded...F23C; dampers and throat restrictors for open fire-places Fulltext... Hierarchy... Expanded...F24; air inlet valves for open fire fronts Fulltext... Hierarchy... Expanded...F24)

|  | F23M |
COMBUSTION CHAMBERS FOR COMBUSTION APPARATUS (support of tube walls for steam boilers Fulltext... Hierarchy... Expanded...F22B; for generating combustion products of high pressure or high velocity Fulltext... Hierarchy... Expanded...F23R)

|  | F23N |
REGULATING OR CONTROLLING COMBUSTION (regulating in general Fulltext... Hierarchy... Expanded...G05)

|  | F23Q |
IGNITION (of cigarettes or tobacco Fulltext... Hierarchy... Expanded...A24F; compositions therefore chemical igniters Fulltext... Hierarchy... Expanded...C06C; devices or installations peculiar to internal-combustion engines Fulltext... Hierarchy... Expanded...F02P); EXTINGUISHING DEVICES

|  | F23R |
GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY (using such products for specific purposes, see the relevant classes for the purposes; chemical aspects of gas production Fulltext... Hierarchy... Expanded...C06D)