|  | 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.

|  | F24F |
AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING (devices for ventilating greenhouses Fulltext... Hierarchy... Expanded...A01G; animal husbandry Fulltext... Hierarchy... Expanded...A01K, e.g. controlling humidity in incubators Fulltext... Hierarchy... Expanded...A01K 41/04; disinfecting or sterilising of air Fulltext... Hierarchy... Expanded...A61L; devices for reconditioning breathing air in sealed rooms or for ventilating gasproof shelters Fulltext... Hierarchy... Expanded...A62B; filtering, washing or drying of gases Fulltext... Hierarchy... Expanded...B01D; mixing gases with vapours or liquids in general Fulltext... Hierarchy... Expanded...B01F 3/00; spraying Fulltext... Hierarchy... Expanded...B05B, Fulltext... Hierarchy... Expanded...B05D; removing dirt or fumes from areas where they are produced Fulltext... Hierarchy... Expanded...B08B 15/00; ventilation, air-conditioning, or cooling, specially adapted for vehicles, see the relevant vehicle places, e.g. Fulltext... Hierarchy... Expanded...B60H, Fulltext... Hierarchy... Expanded...B61D 27/00; production of ozone Fulltext... Hierarchy... Expanded...C01B 13/10; chimneys or flues Fulltext... Hierarchy... Expanded...E04F 17/02, Fulltext... Hierarchy... Expanded...E04H 12/28, Fulltext... Hierarchy... Expanded...F23J 11/00, Fulltext... Hierarchy... Expanded...F23L 17/02; air ducts or conduits Fulltext... Hierarchy... Expanded...E04F 17/04, Fulltext... Hierarchy... Expanded...F16L; ventilation in doors or windows Fulltext... Hierarchy... Expanded...E06B 7/02; fans, blowers Fulltext... Hierarchy... Expanded...F04; noise-absorbing in pipes or pipe systems Fulltext... Hierarchy... Expanded...F16L; tops for chimneys or ventilating shafts Fulltext... Hierarchy... Expanded...F23L; cooling Fulltext... Hierarchy... Expanded...F25; details of heat-exchange or heat-transfer apparatus, of general application Fulltext... Hierarchy... Expanded...F28F; apparatus for generating ions to be introduced into non-enclosed gases, e.g. the atmosphere, Fulltext... Hierarchy... Expanded...H01T 23/00)

|  | F24F |
Note(s) In this subclass: air-humidification as auxiliary treatment in air-conditioning, i.e. in units wherein the air is also either cooled or heated, is covered by groups Fulltext... Hierarchy... Expanded...F24F 1/00 or Fulltext... Hierarchy... Expanded...F24F 3/14; [3] air-humidification per se, e.g. "room humidifiers", is covered by group Fulltext... Hierarchy... Expanded...F24F 6/00. [3] In this subclass, the following terms or expressions are used with the meanings indicated: "air-conditioning" means the supply of air to rooms or spaces by means which provide for the treatment of the air in at least two of the following ways: heating — cooling — any other kind of treatment, e.g. humidification; "ventilation" means the supply of air to, or its extraction from, rooms or spaces, and systems for circulating air within rooms or spaces, but does not cover the mere treatment of air being supplied to, extracted from, or circulated within, rooms or spaces. Processes using enzymes or micro-organisms in order to: liberate, separate or purify a pre-existing compound or composition, or to treat textiles or clean solid surfaces of materials are further classified in subclass Fulltext... Hierarchy... Expanded...C12S. [5]

|  | F24F |
Subclass index
AIR-CONDITIONING |
Room units; central systems; other systems or apparatus | 1/00; 3/00; 5/00
AIR-HUMIDIFICATION | 6/00
VENTILATION | 7/00
SCREENING BY AIR CURRENTS | 9/00
COMMON DETAILS |
Control, safety | 11/00
Use of energy recovery systems | 12/00
Other details | 13/00

|  | F24F 1/00 - F24F 5/00 |
Air-conditioning

P:30 |  | F24F 1/00 |
Room units, e.g. receiving primary air from a central station

|  | F24F 1/01 |
· | in which secondary air is induced by injector action of the primary air (Fulltext... Hierarchy... Expanded...F24F 1/02 takes precedence) [3]

|  | F24F 1/02 |
· | self-contained, i.e. with all apparatus for treatment installed in a common casing

|  | F24F 1/04 |
· · | Arrangements for portability

P:20 |  | F24F 3/00 |
Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems (room units Fulltext... Hierarchy... Expanded...F24F 1/00; construction of heat-exchangers Fulltext... Hierarchy... Expanded...F28)

|  | F24F 3/02 |
· | characterised by the pressure or velocity of the primary air (Fulltext... Hierarchy... Expanded...F24F 3/044 takes precedence) [3]

|  | F24F 3/04 |
· · | operating with high pressure or high velocity

|  | F24F 3/044 |
· | Systems in which all treatment is given in the central station, i.e. all-air systems [3]

|  | F24F 3/048 |
· · | with temperature control at constant rate of air-flow (Fulltext... Hierarchy... Expanded...F24F 3/056 takes precedence) [3]

|  | F24F 3/052 |
· · · | Multiple duct systems, e.g. systems in which hot and cold air are supplied by separate circuits from the central station to mixing chambers in the spaces to be conditioned [3]

|  | F24F 3/056 |
· · | the air at least partially flowing over lighting fixtures, the heat of which is dissipated or used [3]

|  | F24F 3/06 |
· | characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units (Fulltext... Hierarchy... Expanded...F24F 3/02 takes precedence)

|  | F24F 3/08 |
· · | with separate supply and return lines for hot and cold heat-exchange fluids

|  | F24F 3/10 |
· · | with separate supply lines and common return line for hot and cold heat-exchange fluids

|  | F24F 3/12 |
· | characterised by the treatment of the air otherwise than by heating and cooling (Fulltext... Hierarchy... Expanded...F24F 3/02, Fulltext... Hierarchy... Expanded...F24F 3/06 take precedence; apparatus for the individual treatment, see the appropriate subclasses for the treatments)

|  | F24F 3/14 |
· · | by humidification; by dehumidification

|  | F24F 3/147 |
· · · | with both heat and humidity transfer between supplied and exhausted air [3]

|  | F24F 3/153 |
· · · | with subsequent heating, i.e. with the air, given the required humidity in the central station, passing a heating element to achieve the required temperature [3]

|  | F24F 3/16 |
· · | by purification, e.g. by filtering; by sterilisation; by ozonisation

P:40 |  | F24F 5/00 |
Air-conditioning systems or apparatus not covered by group Fulltext... Hierarchy... Expanded...F24F 1/00 or Fulltext... Hierarchy... Expanded...F24F 3/00

P:50 |  | F24F 6/00 |
Air-humidification [3]

|  | F24F 6/02 |
· | by evaporation of water in the air [3]

|  | F24F 6/04 |
· · | using stationary unheated wet elements [3]

|  | F24F 6/06 |
· · | using moving unheated wet elements [3]

|  | F24F 6/08 |
· · | using heated wet elements [3]

|  | F24F 6/10 |
· · · | heated electrically [3]

|  | F24F 6/12 |
· | by forming water dispersions in the air [3]

|  | F24F 6/14 |
· · | using nozzles (nozzles per se, spraying in general Fulltext... Hierarchy... Expanded...B05B) [3]

|  | F24F 6/16 |
· · | using rotating elements [3]

|  | F24F 6/18 |
· | by injection of steam into the air [3]

P:60 |  | F24F 7/00 |
Ventilation

|  | F24F 7/007 |
· | with forced flow (using ducting systems Fulltext... Hierarchy... Expanded...F24F 7/06) [3]

|  | F24F 7/013 |
· · | using wall or window fans, displacing air through the wall or window [3]

|  | F24F 7/02 |
· | Roof ventilation (Fulltext... Hierarchy... Expanded...F24F 7/007 takes precedence; ventilation of roof coverings Fulltext... Hierarchy... Expanded...E04D) [3,6]

|  | F24F 7/04 |
· | with ducting systems

|  | F24F 7/06 |
· · | with forced air circulation, e.g. by fan

|  | F24F 7/08 |
· · · | with separate ducts for supplied and exhausted air [3]

|  | F24F 7/10 |
· · · | with air supply, or exhaust, through perforated wall, floor or ceiling (outlet members for directing or distributing air Fulltext... Hierarchy... Expanded...F24F 13/06) [3]

P:70 |  | F24F 9/00 |
Use of air currents for screening, e.g. air curtain (air curtains for vehicles Fulltext... Hierarchy... Expanded...B60J 9/04)

|  | F24F 11/00 - F24F 13/00 |
Common features or details

P:0 |  | F24F 11/00 |
Control or safety systems or apparatus (control valves per se Fulltext... Hierarchy... Expanded...F16K) [3]

|  | F24F 11/02 |
· | Arrangement or mounting of control or safety devices

|  | F24F 11/04 |
· · | solely for controlling the rate of air-flow (Fulltext... Hierarchy... Expanded...F24F 11/08 takes precedence)

|  | F24F 11/047 |
· · · | to constant value [3]

|  | F24F 11/053 |
· · · | by means responsive to temperature [3]

|  | F24F 11/06 |
· · | solely for controlling the supply of heating or cooling fluids for secondary treatment (Fulltext... Hierarchy... Expanded...F24F 11/08 takes precedence)

|  | F24F 11/08 |
· · | for controlling the primary treatment of air

P:10 |  | F24F 12/00 |
Use of energy recovery systems in air conditioning, ventilation or screening (with both heat and humidity transfer between supplied and exhausted air Fulltext... Hierarchy... Expanded...F24F 3/147; heat-exchange in general Fulltext... Hierarchy... Expanded...F28) [4]

P:80 |  | F24F 13/00 |
Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening

|  | F24F 13/02 |
· | Ducting arrangements

|  | F24F 13/04 |
· · | Air-mixing units (Fulltext... Hierarchy... Expanded...F24F 13/06 takes precedence; mixing gases in general Fulltext... Hierarchy... Expanded...B01F 3/02)

|  | F24F 13/06 |
· · | Outlets for directing or distributing air into rooms or spaces, e.g. ceiling air diffuser

|  | F24F 13/062 |
· · · | having one or more bowls or cones diverging in the flow direction (Fulltext... Hierarchy... Expanded...F24F 13/072 takes precedence) [3]

|  | F24F 13/065 |
· · · | formed as cylindrical or spherical bodies which are rotatable (Fulltext... Hierarchy... Expanded...F24F 13/072 takes precedence) [3]

|  | F24F 13/068 |
· · · | formed as perforated walls, ceilings or floors (Fulltext... Hierarchy... Expanded...F24F 13/078 takes precedence) [3]

|  | F24F 13/072 |
· · · | of elongated shape, e.g. between ceiling panels [3]

|  | F24F 13/075 |
· · · | having parallel rods or lamellae directing the outflow, e.g. the rods or lamellae being individually adjustable (Fulltext... Hierarchy... Expanded...F24F 13/072 takes precedence) [3]

|  | F24F 13/078 |
· · · | combined with lighting fixtures (air-treatment systems with air-flow over lighting fixtures Fulltext... Hierarchy... Expanded...F24F 3/056) [3]

|  | F24F 13/08 |
· | Air-flow control members, e.g. louvres, grilles, flaps, guide plates (Fulltext... Hierarchy... Expanded...F24F 7/013, Fulltext... Hierarchy... Expanded...F24F 13/06 take precedence; roof ventilation Fulltext... Hierarchy... Expanded...F24F 7/02) [3]

|  | F24F 13/10 |
· · | movable, e.g. damper (Fulltext... Hierarchy... Expanded...F24F 13/18 takes precedence; valves in general Fulltext... Hierarchy... Expanded...F16K)

|  | F24F 13/12 |
· · · | built-up of sliding members

|  | F24F 13/14 |
· · · | built-up of tilting members, e.g. louvre

|  | F24F 13/15 |
· · · · | with parallel simultaneously tiltable lamellae [3]

|  | F24F 13/16 |
· · · | built-up of parallelly-movable plates

|  | F24F 13/18 |
· · | specially adapted for insertion in flat panels, e.g. in door or window-pane

|  | F24F 13/20 |
· | Casings or covers [5]

|  | F24F 13/22 |
· | Means for preventing condensation or evacuating condensate [5]

|  | F24F 13/24 |
· | Means for preventing or suppressing noise [5]

|  | F24F 13/26 |
· | Arrangements for air-circulation by means of induction, e.g. by fluid coupling or thermal effect [6]

|  | F24F 13/28 |
· | Arrangement or mounting of filters [6]

|  | F24F 13/30 |
· | Arrangement or mounting of heat-exchangers [6]

|  | F24F 13/32 |
· | Supports for air-conditioning, air-humidification or ventilation units [6]