|  | 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

|  | F24 |
HEATING; RANGES; VENTILATING (protecting plants by heating in gardens, orchards, or forests Fulltext... Hierarchy... Expanded...A01G 13/06; baking ovens and apparatus Fulltext... Hierarchy... Expanded...A21B; cooking devices other than ranges Fulltext... Hierarchy... Expanded...A47J; forging Fulltext... Hierarchy... Expanded...B21J, Fulltext... Hierarchy... Expanded...B21K; specially adapted for vehicles, see the relevant subclasses of classes Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...B60-B64; combustion apparatus in general Fulltext... Hierarchy... Expanded...F23; drying Fulltext... Hierarchy... Expanded...F26B; ovens in general Fulltext... Hierarchy... Expanded...F27; electric heating elements or arrangements Fulltext... Hierarchy... Expanded...H05B)

|  | F24 |
Note(s) In this class, the following terms are used with the meanings indicated: "stove" includes apparatus which may have an open fire, e.g. fireplace; "range" means an apparatus for cooking having elements that perform different cooking operations or cooking and heating operations.

|  | F24D |
DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR (preventing corrosion Fulltext... Hierarchy... Expanded...C23F; water supply in general Fulltext... Hierarchy... Expanded...E03; using steam or condensate extracted or exhausted from steam engine plants for heating purposes Fulltext... Hierarchy... Expanded...F01K 17/02; steam traps Fulltext... Hierarchy... Expanded...F16T; domestic stoves or ranges Fulltext... Hierarchy... Expanded...F24B, Fulltext... Hierarchy... Expanded...F24C; water or air heaters having heat generating means Fulltext... Hierarchy... Expanded...F24H; combined heating and refrigeration systems Fulltext... Hierarchy... Expanded...F25B; heat exchange apparatus or elements Fulltext... Hierarchy... Expanded...F28; removing furring Fulltext... Hierarchy... Expanded...F28G)

|  | F24D |
Note(s) In this subclass, the following expression is used with the meaning indicated: "central heating system" means a system in which heat is generated or stored at central sources and is distributed by means of a transfer fluid to the spaces or areas to be heated. [5]

|  | F24D |
Subclass index
CENTRAL HEATING SYSTEMS |
With heat-transfer fluid: steam; hot water; hot air or exhaust gas; other fluid | 1/00; 3/00; 5/00; 7/00
Combinations | 9/00
District heating systems | 10/00
By heat storage | 11/00
Other systems | 12/00
OTHER DOMESTIC- OR SPACE-HEATING SYSTEMS |
Electric; Other | 13/00; 15/00
DOMESTIC HOT-WATER SUPPLY | 17/00
DETAILS | 19/00

|  | F24D 1/00 - F24D 12/00 |
Central heating systems

P:30 |  | F24D 1/00 |
Steam central heating systems (Fulltext... Hierarchy... Expanded...F24D 10/00, Fulltext... Hierarchy... Expanded...F24D 11/00 take precedence)

|  | F24D 1/02 |
· | operating with live steam

|  | F24D 1/04 |
· | operating with exhaust steam

|  | F24D 1/06 |
· | operating with superheated steam

|  | F24D 1/08 |
· | Feed-line arrangements, e.g. providing for one-pipe system

P:40 |  | F24D 3/00 |
Hot-water central heating systems (Fulltext... Hierarchy... Expanded...F24D 10/00, Fulltext... Hierarchy... Expanded...F24D 11/00 take precedence)

|  | F24D 3/02 |
· | with forced circulation, e.g. by pumps

|  | F24D 3/04 |
· | with the water under high pressure

|  | F24D 3/06 |
· · | Arrangements or devices for maintaining high pressure

|  | F24D 3/08 |
· | in combination with systems for domestic hot-water supply

|  | F24D 3/10 |
· | Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks

|  | F24D 3/12 |
· | Tube and panel arrangements for ceiling, wall, or underfloor heating (electric underfloor heating Fulltext... Hierarchy... Expanded...F24D 13/02; special adaptations of floors for incorporating ducts, e.g. for heating or ventilating, Fulltext... Hierarchy... Expanded...E04B 5/48; building elements of block or other shape for the construction of parts of buildings characterised by special adaptations, e.g. serving for locating conduits, Fulltext... Hierarchy... Expanded...E04C 1/39; building elements of relatively thin form for the construction of parts of buildings with special adaptations for auxiliary purposes, e.g. serving for locating conduits, Fulltext... Hierarchy... Expanded...E04C 2/52) [4]

|  | F24D 3/14 |
· · | incorporated in a ceiling, wall or floor [4]

|  | F24D 3/16 |
· · | mounted on, or adjacent to, a ceiling, wall or floor [4]

|  | F24D 3/18 |
· | using heat pumps [5]

P:50 |  | F24D 5/00 |
Hot-air central heating systems (Fulltext... Hierarchy... Expanded...F24D 10/00, Fulltext... Hierarchy... Expanded...F24D 11/00 take precedence; air conditioning Fulltext... Hierarchy... Expanded...F24F); Exhaust-gas central heating systems

|  | F24D 5/02 |
· | operating with discharge of hot air into the space or area to be heated

|  | F24D 5/04 |
· · | with return of the air to the air heater

|  | F24D 5/06 |
· | operating without discharge of hot air into the space or area to be heated

|  | F24D 5/08 |
· · | with hot air led through radiators

|  | F24D 5/10 |
· · | with hot air led through heat-exchange ducts in the walls, floor, or ceiling

|  | F24D 5/12 |
· | using heat pumps [5]

P:60 |  | F24D 7/00 |
Central heating systems employing heat-transfer fluids not covered by groups Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...F24D 1/00-F24D 5/00, e.g. oil, salt, gas (Fulltext... Hierarchy... Expanded...F24D 10/00, Fulltext... Hierarchy... Expanded...F24D 11/00 take precedence)

P:20 |  | F24D 9/00 |
Central heating systems employing combinations of heat-transfer fluids covered by two or more of groups Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...F24D 1/00-F24D 7/00 (Fulltext... Hierarchy... Expanded...F24D 10/00, Fulltext... Hierarchy... Expanded...F24D 11/00 take precedence)

|  | F24D 9/02 |
· | Hot water and steam systems

P:0 |  | F24D 10/00 |
District heating systems [5]

P:10 |  | F24D 11/00 |
Central heating systems using heat accumulated in storage masses (self-contained storage heating units Fulltext... Hierarchy... Expanded...F24D 15/02; storage masses, see the relevant subclasses)

|  | F24D 11/02 |
· | using heat pumps

P:70 |  | F24D 12/00 |
Other central heating systems

|  | F24D 12/02 |
· | having more than one heat source (Fulltext... Hierarchy... Expanded...F24D 3/18, Fulltext... Hierarchy... Expanded...F24D 5/12, Fulltext... Hierarchy... Expanded...F24D 11/02 take precedence) [5]

|  | F24D 13/00 - F24D 15/00 |
Other domestic- or space-heating systems

P:80 |  | F24D 13/00 |
Electric heating systems (electric water or air heaters Fulltext... Hierarchy... Expanded...F24H)

|  | F24D 13/02 |
· | solely using resistance heating, e.g. underfloor heating

|  | F24D 13/04 |
· | using electric heating of heat-transfer fluid in separate units of the system

P:90 |  | F24D 15/00 |
Other domestic- or space-heating systems

|  | F24D 15/02 |
· | consisting of self-contained heating units, e.g. storage heaters [3]

|  | F24D 15/04 |
· | using heat pumps [5]

P:100 |  | F24D 17/00 |
Domestic hot-water supply systems (combined with domestic- or space-heating systems Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...F24D 1/00-F24D 15/00)

|  | F24D 17/02 |
· | using heat pumps [5]

P:110 |  | F24D 19/00 |
Details (of water or air heaters Fulltext... Hierarchy... Expanded...F24H 9/00; of heat-exchange or heat-transfer apparatus, of general application Fulltext... Hierarchy... Expanded...F28F) [3]

|  | F24D 19/02 |
· | Arrangement of mountings or supports for radiators [3]

|  | F24D 19/04 |
· · | in skirtings [3]

|  | F24D 19/06 |
· | Casings, cover lids or ornamental panels, for radiators [3]

|  | F24D 19/08 |
· | Arrangements for drainage, venting or aerating (valves for drainage Fulltext... Hierarchy... Expanded...F16K, e.g. Fulltext... Hierarchy... Expanded...F16K 21/00, for venting or aerating Fulltext... Hierarchy... Expanded...F16K 24/00) [3]

|  | F24D 19/10 |
· | Arrangement or mounting of control or safety devices (control valves Fulltext... Hierarchy... Expanded...F16K; only the heater being controlled Fulltext... Hierarchy... Expanded...F24H 9/20) [3]