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

|  | F01 - F04 |
Subsection index
MACHINES |
positive displacement |
rotary or oscillating piston |
liquid and elastic fluid or elastic fluid | F01C
liquid only | F04C
reciprocating piston or other |
liquid and elastic fluid or elastic fluid | F01B
liquid only | F04B
non-positive displacement |
liquid and elastic fluid or elastic fluid | F01D
liquid only | F03B
ENGINES |
positive displacement |
rotary or oscillating piston |
liquid and elastic fluid or elastic fluid | F01C
liquid only | F03C
reciprocating piston or other |
liquid and elastic fluid or elastic fluid | F01B
liquid only | F03C
non-positive displacement |
liquid and elastic fluid or elastic fluid | F01D
liquid only | F03B
PUMPS |
positive displacement |
rotary or oscillating piston | F04C
reciprocating piston or other | F04B
non-positive displacement | F04D

LIGHTING; HEATING

|  | F23 |
COMBUSTION APPARATUS; COMBUSTION PROCESSES

|  | F23 |
Note(s) In this class, the following terms or expressions 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 covered by section C or by subclass 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.

|  | F23L |
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, Fulltext... Hierarchy... Expanded...F23C; dampers or throat restrictors for open fire-places Fulltext... Hierarchy... Expanded...F24; air inlet valves for open fire fronts Fulltext... Hierarchy... Expanded...F24)

|  | F23L |
Subclass index
AIR SUPPLY |
Passages for: primary air; secondary air | 1/00; 9/00
Valves or dampers |
construction | 13/00
arrangements: before the fire; after the fire | 3/00; 11/00
Blast-producing apparatus before the fire; heating of air for combustion | 5/00; 15/00
SUPPLYING NON-COMBUSTIBLE LIQUIDS OR GASES, OTHER THAN AIR, TO THE FIRE | 7/00
DRAUGHT-INDUCING | 17/00
SUBJECT MATTER NOT PROVIDED FOR IN OTHER GROUPS OF THIS SUBCLASS | 99/00

P:80 |  | F23L 1/00 |
Passages or apertures for delivering primary air for combustion

P:40 |  | F23L 3/00 |
Arrangements of valves or dampers before the fire

P:20 |  | F23L 5/00 |
Blast-producing apparatus before the fire

P:0 |  | F23L 7/00 |
Supplying non-combustible liquids or gases, other than air, to the fire, e.g. oxygen, steam

P:70 |  | F23L 9/00 |
Passages or apertures for delivering secondary air for completing combustion of fuel

P:50 |  | F23L 11/00 |
Arrangements of valves or dampers after the fire

P:60 |  | F23L 13/00 |
Construction of valves or dampers for controlling air supply or draught (in general Fulltext... Hierarchy... Expanded...F16K)

P:10 |  | F23L 15/00 |
Heating of air supplied for combustion

P:30 |  | F23L 17/00 |
Inducing draught

P:90 |  | F23L 99/00 |
Subject matter not provided for in other groups of this subclass [8]