Cooperative Patent Classification


Version: 2018.08
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CPC
COOPERATIVE PATENT CLASSIFICATION
F24F
AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING (removing dirt or fumes from areas where they are produced B08B 15/00; vertical ducts for carrying away waste gases from buildings E04F 17/02; tops for chimneys or ventilating shafts, terminals for flues F23L 17/02) [2018-08]
NOTES

  • 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 F24F 1/00 or F24F 3/14;
    • air-humidification per se, e.g. "room humidifiers", is covered by group F24F 6/00.
  • 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.
  • In this subclass, control or safety arrangements are classified in F24F 11/00. In order to indicate the type of air- treatment system in which these arrangements are used, further classification may be made in main groups F24F 1/00 -F24F 9/00.
WARNING

  • In this subclass non-limiting references (in the sense of paragraph 39 of the Guide to the IPC) may still be displayed in the scheme.
F24F 1/00
Room units, e.g. separate or self-contained units or units receiving primary air from a central station {or with supply of heating or cooling agents from a central station, such as those applied to air-treatment systems included in F24F 3/00 and F24F 5/00} [2018-01]
F24F 1/0003
.
{Split units} [2013-01]
F24F 1/0007
.
{Fan coil units, e.g. using an evaporating refrigerant} [2013-01]
F24F 1/0011
. .
{characterised by the air outlet} [2013-01]
F24F 1/0014
. . .
{with two or more blow out openings} [2013-01]
F24F 1/0018
. .
{characterised by the fan} [2013-01]
F24F 1/0022
. . .
{Centrifugal or radial fan} [2013-01]
F24F 1/0025
. . .
{Cross flow or tangential fan} [2013-01]
F24F 1/0029
. . .
{Axial fan} [2013-01]
F24F 1/0033
. . .
{comprising two or more fans} [2013-01]
F24F 2001/0037
. .
{mounted in or under the ceiling} [2013-01]
F24F 2001/004
. .
{mounted or standing on the floor} [2013-01]
F24F 2001/0044
. .
{mounted at least partially under the floor or the outlet air is being distributed under the floor (HVAC with raised floors F24F 2221/40)} [2013-01]
F24F 2001/0048
. .
{mounted in or on the wall} [2013-01]
F24F 2001/0051
. .
{Introducing outside air to rooms} [2013-01]
F24F 2001/0055
. .
{Exhausting internal air from rooms} [2013-01]
F24F 1/0059
.
{characterised by the heat exchanger} [2013-01]
F24F 2001/0062
.
{receiving air from a central station} [2013-01]
F24F 2001/0066
. .
{with air treatment in the central station and in the room unit} [2013-01]
F24F 2001/007
. .
{with air treatment in the room unit} [2013-01]
F24F 2001/0074
.
{receiving heat exchange fluid} [2013-01]
F24F 2001/0077
. .
{the fluid entering and leaving the room unit as a liquid} [2013-01]
F24F 2001/0081
. .
{the fluid entering the room unit as a liquid and leaving it as a gas} [2013-01]
F24F 2001/0085
.
{using the cooling effect of evaporating fluid either evaporating directly in the room air, in the air supplied to the room or in the outside air} [2013-01]
F24F 2001/0088
. .
{evaporating directly in the room air or the air supplied to the room} [2013-01]
F24F 2001/0092
. .
{evaporating in the outside air, e.g. evaporation heat being extracted from the room air by indirect heat exchange} [2013-01]
F24F 2001/0096
.
{Units supplying highly filtered air to a room or to a limited area within a room} [2013-01]
F24F 1/01
.
in which secondary air is induced by injector action of the primary air (F24F 1/02 takes precedence; {arrangement or assembly of or components for the regulation of the air supply through a heat exchanger and the associated bypass for the secondary treatment of the air F24F 11/81; nozzle for induction unit F24F 13/26}) [2018-01]
F24F 1/02
.
self-contained, i.e. with all apparatus for treatment installed in a common casing {(arrangement or assembly of components for the primary treatment of air in independent units F24F 11/30)} [2018-01]
F24F 1/022
. .
{Comprising a compressor cycle} [2013-01]
F24F 1/025
. . .
{Portable} [2013-01]
F24F 1/027
. . .
{mounted in wall openings, e.g. in windows} [2013-01]
F24F 1/04
. .
Arrangements for portability [2013-01]
F24F 1/06
.
Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger [2018-08]
NOTE


  • In this group, the first place priority rule is applied, i.e. at each hierarchical level, in the absence of an indication to the contrary, classification is made in the first appropriate place.
F24F 1/08
. .
Compressors specially adapted for separate outdoor units [2013-01]
F24F 1/10
. . .
Arrangement or mounting thereof [2013-01]
F24F 1/12
. . .
Vibration or noise prevention thereof [2013-01]
F24F 1/14
. .
Heat exchangers specially adapted for separate outdoor units [2017-08]
F24F 1/16
. . .
Arrangement or mounting thereof [2013-01]
F24F 1/18
. . .
characterised by their shape [2017-08]
F24F 1/20
. .
Electric components for separate outdoor units [2013-01]
F24F 1/22
. . .
Arrangement or mounting thereof [2013-01]
F24F 1/24
. . .
Cooling of electric components [2013-01]
F24F 1/26
. .
Refrigerant piping [2013-01]
F24F 1/28
. . .
for connecting several separate outdoor units [2013-01]
F24F 1/30
. . .
for use inside the separate outdoor units [2013-01]
F24F 1/32
. . .
for connecting the separate outdoor units to indoor units [2013-01]
F24F 1/34
. . .
Protection means thereof, e.g. covers for refrigerant pipes [2013-01]
F24F 1/36
. .
Drip trays for outdoor units [2013-01]
F24F 1/38
. .
Fan details of outdoor units, e.g. bell-mouth shaped inlets or fan mountings [2017-08]
F24F 1/40
. .
Vibration or noise prevention at outdoor units (for outdoor units compressors F24F 1/12) [2013-01]
F24F 1/42
. .
characterised by the use of the condensate, e.g. for enhanced cooling [2017-08]
F24F 1/44
. .
characterised by the use of internal combustion engines [2017-08]
F24F 1/46
. .
Component arrangements in separate outdoor units [2013-01]
F24F 1/48
. . .
characterised by air airflow, e.g. inlet or outlet airflow [2017-08]
F24F 1/50
. . . .
with outlet air in upward direction [2013-01]
F24F 1/52
. . . .
with inlet and outlet arranged on the same side, e.g. for mounting in a wall opening [2013-01]
F24F 1/54
. . . .
Inlet and outlet arranged on opposite sides [2013-01]
F24F 1/56
. .
Casing or covers of separate outdoor units, e.g. fan guards [2013-01]
F24F 1/58
. . .
Separate protective covers for outdoor units, e.g. solar guards, snow shields or camouflage [2013-01]
F24F 1/60
. .
Arrangement or mounting of the outdoor unit [2013-01]
F24F 1/62
. . .
Wall-mounted [2013-01]
F24F 1/64
. . .
Ceiling-mounted, e.g. below a balcony [2013-01]
F24F 1/66
. . .
under the floor level [2013-01]
F24F 1/68
. . .
Arrangement of multiple separate outdoor units [2013-01]
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 F24F 1/00) [2018-01]
F24F 3/001
.
{in which the air treatment in the central station takes place by means of a heat-pump or by means of a reversible cycle (regulation of heat-pump circuit in air treatment systems F25B 29/00; heat pumps F25B 13/00, F25B 29/00; reversible cycle for humidifying and drying air F24F 3/147)} [2013-01]
F24F 2003/003
.
{with primary air treatment in the central station and subsequent secondary air treatment in air treatment units located in or near the rooms} [2013-01]
F24F 2003/005
. .
{with a single air duct for transporting treated primary air from the central station to air treatment units located in or near the rooms} [2013-01]
F24F 2003/006
. .
{with two air ducts for separately transporting treated hot and cold primary air from the central station to air treatment units located in or near the rooms} [2013-01]
F24F 2003/008
.
{Supplying highly filtered air to a room or to a limited area within a room} [2013-01]
F24F 3/02
.
characterised by the pressure or velocity of the primary air [2018-08]
WARNING

F24F 3/04
. .
operating with high pressure or high velocity [2018-08]
WARNING

F24F 3/044
.
Systems in which all treatment is given in the central station, i.e. all-air systems [2018-08]
WARNING

F24F 3/0442
. .
{with volume control at a constant temperature} [2018-08]
WARNING

F24F 3/0444
. . .
{in which two airstreams are conducted from the central station via independent conduits to the space to be treated, of which one has a constant volume and a season-adapted temperature to compensate for the fluctuating heat transfer losses of the building, while the other varies in volume and is always cold in order to compensate for the interior fluctuations and variable solar heating effects, i.e. so-called "Dual Conduit System"; this system is similar to a high-pressure air-water system} [2018-08]
WARNING

F24F 2003/0446
. .
{with a single air duct for transporting treated air from the central station to the rooms} [2018-08]
WARNING

F24F 2003/0448
. .
{with two air ducts for separately transporting treated hot and cold air from the central station to the rooms} [2018-08]
WARNING

F24F 3/048
. .
with temperature control at constant rate of air-flow [2018-08]
WARNING

  • Group F24F 3/048 is incomplete pending reclassification of documents from group F24F 3/056.
    Group F24F 3/048 is also impacted by reclassification into groups F24F 3/02 and F24F 3/04.
    All groups listed in this Warning should be considered in order to perform a complete search.
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 [2018-08]
WARNING

  • Group F24F 3/052 is incomplete pending reclassification of documents from group F24F 3/056.
    Group F24F 3/052 is also impacted by reclassification into groups F24F 3/02 and F24F 3/04.
    All groups listed in this Warning should be considered in order to perform a complete search.
F24F 3/0522
. . . .
{in which warm or cold air from the central station is delivered via individual pipes to mixing chambers in the space to be treated, the cold air/warm air ratio being controlled by a thermostat in the space concerned, i.e. so-called Dual-duct System} [2018-08]
WARNING

  • Group F24F 3/0522 is incomplete pending reclassification of documents from group F24F 3/056.
    Group F24F 3/0522 is also impacted by reclassification into groups F24F 3/02 and F24F 3/04.
    All groups listed in this Warning should be considered in order to perform a complete search.
F24F 3/0525
. . . .
{in which the air treated in the central station is reheated; this may take place near the central station upon arrival, in the space to be treated, in a branch pipe to zone in a multi-zone system or in the warm pipe in a system having separate supply conduits for warm and cold air} [2018-08]
WARNING

  • Group F24F 3/0525 is incomplete pending reclassification of documents from group F24F 3/056.
    Group F24F 3/0525 is also impacted by reclassification into groups F24F 3/02 and F24F 3/04.
    All groups listed in this Warning should be considered in order to perform a complete search.
F24F 3/0527
. . . .
{in which treated air having differing temperatures is conducted through independent conduits from the central station to various spaces to be treated, i.e. so-called "multi-Zone" system; (F24F 3/0525 takes precedence)} [2018-08]
WARNING

  • Group F24F 3/0527 is incomplete pending reclassification of documents from group F24F 3/056.
    Group F24F 3/0527 is also impacted by reclassification into groups F24F 3/02 and F24F 3/04.
    All groups listed in this Warning should be considered in order to perform a complete search.
F24F 3/056
. .
the air at least partially flowing over lighting fixtures, the heat of which is dissipated or used  (outlets for directing or distributing air into rooms or spaces combined with lighting fixtures F24F 13/078) [2018-08]
WARNING

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 [2018-08]
WARNING

F24F 3/065
. .
{with a plurality of evaporators or condensers} [2018-08]
WARNING

F24F 3/08
. .
with separate supply and return lines for hot and cold heat-exchange fluids {i.e. so-called "4-conduit" system} [2018-08]
WARNING

F24F 3/10
. .
with separate supply lines and common return line for hot and cold heat-exchange fluids {i.e. so-called "3-conduit" system} [2018-08]
WARNING

F24F 3/12
.
characterised by the treatment of the air otherwise than by heating and cooling [2018-08]
WARNING

F24F 3/14
. .
by humidification; by dehumidification [2018-08]
WARNING

F24F 3/1405
. . .
{in which the humidity of the air is exclusively affected by contact with the evaporator of a closed-circuit cooling system or heat pump circuit} [2018-08]
WARNING

F24F 3/1411
. . .
{by absorbing or adsorbing water, e.g. using an hygroscopic desiccant} [2018-08]
WARNING

F24F 3/1417
. . . .
{with liquid hygroscopic desiccants} [2018-08]
WARNING

F24F 3/1423
. . . .
{with a moving bed of solid desiccants, e.g. a rotary wheel supporting solid desiccants} [2018-08]
WARNING

F24F 3/1429
. . . .
{alternatively operating a heat exchanger in an absorbing/adsorbing mode and a heat exchanger in a regeneration mode} [2018-08]
WARNING

F24F 2003/1435
. . .
{comprising semi-permeable membrane} [2018-08]
WARNING

F24F 2003/144
. . .
{by dehumidification only} [2018-08]
WARNING

F24F 2003/1446
. . . .
{by condensing} [2018-08]
WARNING

F24F 2003/1452
. . . . .
{heat extracted from the humid air for condensing is returned to the dried air} [2018-08]
WARNING

F24F 2003/1458
. . .
{using regenerators} [2018-08]
WARNING

F24F 2003/1464
. . . .
{using rotating regenerators} [2018-08]
WARNING

F24F 3/147
. . .
with both heat and humidity transfer between supplied and exhausted air [2018-08]
WARNING

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 [2018-08]
WARNING

F24F 3/16
. .
by purification, e.g. by filtering; by sterilisation; by ozonisation {(ion sources H01J 27/02, H01J 37/08; treatment rooms or enclosures for medical purposes A61G 10/00)} [2018-08]
WARNING

F24F 3/1603
. . .
{by filtering (arrangements or mounting of filters F24F 13/28)} [2018-08]
WARNING

F24F 3/1607
. . . .
{Clean air work stations, i.e. selected areas within a space to which filtered air is passed (means providing sterile air at a surgical operation table or area A61G 13/108)} [2018-08]
WARNING

F24F 3/161
. . . .
{Clean rooms, i.e. enclosed spaces in which a uniform flow of filtered air is distributed (air distribution by perforated walls F24F 7/10; dust-free rooms or enclosures applicable solely to laboratory purposes B01L 1/04)} [2018-08]
WARNING

F24F 2003/1614
. . . .
{using a dry filtering element} [2018-08]
WARNING

F24F 2003/1617
. . . .
{using wet filtering methods} [2018-08]
WARNING

F24F 2003/1621
. . . .
{using chemical filtering methods} [2018-08]
WARNING

F24F 2003/1625
. . . . .
{using active carbon} [2018-08]
WARNING

F24F 2003/1628
. . . . .
{using catalytic reaction} [2018-08]
WARNING

F24F 2003/1632
. . . .
{using vortex} [2018-08]
WARNING

F24F 2003/1635
. . . .
{using high voltage} [2018-08]
WARNING

F24F 2003/1639
. . . .
{with filter cleaning} [2018-08]
WARNING

F24F 2003/1642
. . . .
{of pollen, to avoid allergies} [2018-08]
WARNING

F24F 2003/1646
. . . .
{of tobacco smoke} [2018-08]
WARNING

F24F 2003/165
. . . .
{of ozone} [2018-08]
WARNING

F24F 2003/1653
. . . .
{using biofilters, plants or microorganisms} [2018-08]
WARNING

F24F 2003/1657
. . . .
{the air pollution of a street or a city} [2018-08]
WARNING

F24F 3/166
. . .
{using electric means, e.g. applying electrostatic field (using thermo-electric means F24F 5/0042)} [2018-08]
WARNING

F24F 2003/1664
. . .
{by sterilisation} [2018-08]
WARNING

F24F 2003/1667
. . . .
{using UV light} [2018-08]
WARNING

F24F 2003/1671
. . . .
{using ozone} [2018-08]
WARNING

F24F 2003/1675
. . . .
{using a sterilising medium} [2018-08]
WARNING

F24F 2003/1678
. . . .
{to avoid the Legionella bacteria} [2018-08]
WARNING

F24F 2003/1682
. . .
{by ionisation} [2018-08]
WARNING

F24F 2003/1685
. . .
{by ozonisation} [2018-08]
WARNING

F24F 2003/1689
. . .
{by odorising} [2018-08]
WARNING

F24F 2003/1692
. . .
{by adding oxygen} [2018-08]
WARNING

F24F 2003/1696
. . .
{by removing radon} [2018-08]
WARNING

F24F 5/00
Air-conditioning systems or apparatus not covered by F24F 1/00 or F24F 3/00 {, e.g. using solar heat or combined with household units such as an oven or water heater} [2018-01]
F24F 5/0003
.
{Exclusively-fluid systems} [2013-01]
F24F 5/0007
.
{cooling apparatus specially adapted for use in air-conditioning (self-contained room units F24F 1/02; F24F 5/0046 takes precedence; air-humidification F24F 6/00)} [2013-01]
F24F 5/001
. .
{Compression cycle type} [2013-01]
F24F 5/0014
. .
{using absorption or desorption} [2013-01]
F24F 5/0017
. .
{using cold storage bodies, e.g. ice} [2013-01]
F24F 5/0021
. . .
{using phase change material [PCM] for storage} [2013-01]
F24F 2005/0025
. . .
{using heat exchange fluid storage tanks} [2013-01]
F24F 2005/0028
. . .
{using hydridable metals as energy storage media} [2013-01]
F24F 2005/0032
. . .
{Systems storing energy during the night} [2013-01]
F24F 5/0035
. .
{using evaporation} [2013-01]
F24F 2005/0039
. .
{using a cryogen, e.g. CO2 liquid or N2 liquid} [2013-01]
F24F 5/0042
.
{characterised by the application of thermo-electric units or the Peltier effect (refrigerators and cooling systems using magnetic or electrical effects in general F25B 21/02; for semi-conductors H01L 23/38; thermobatteries or thermogenerators H01L 35/00)} [2013-01]
F24F 5/0046
.
{using natural energy, e.g. solar energy, energy from the ground} [2013-01]
F24F 5/005
. .
{using energy from the ground by air circulation, e.g. "Canadian well"} [2013-01]
F24F 2005/0053
. .
{receiving heat-exchange fluid from a well} [2013-01]
F24F 2005/0057
. .
{receiving heat-exchange fluid from a closed circuit in the ground} [2013-01]
F24F 2005/006
. .
{receiving heat-exchange fluid from the drinking or sanitary water supply circuit} [2013-01]
F24F 2005/0064
. .
{using solar energy} [2013-01]
F24F 2005/0067
. . .
{with photovoltaic panels} [2013-01]
F24F 5/0071
.
{adapted for use in covered swimming pools} [2013-01]
F24F 5/0075
.
{Systems using thermal walls, e.g. double window (double windows per se E06B)} [2013-01]
F24F 2005/0078
. .
{Double windows} [2013-01]
F24F 2005/0082
. .
{Facades} [2013-01]
F24F 5/0085
.
{Systems using a compressed air circuit (B64D 13/00, B60H take precedence)} [2013-01]
F24F 5/0089
.
{Systems using radiation from walls or panels} [2013-01]
F24F 5/0092
. .
{ceilings, e.g. cool ceilings} [2013-01]
F24F 5/0096
.
{combined with domestic apparatus} [2013-01]
F24F 6/00
Air-humidification {, e.g. cooling by humidification} [2018-01]
F24F 2006/001
.
{using a water curtain} [2013-01]
F24F 2006/003
.
{using a decorative fountain} [2013-01]
F24F 2006/005
.
{using plants} [2013-01]
F24F 2006/006
.
{with water treatment} [2013-01]
F24F 2006/008
.
{Air-humidifier with water reservoir} [2013-01]
F24F 6/02
.
by evaporation of water in the air {(humidifiers specially adapted for radiators see F24D 19/008)} [2013-01]
F24F 6/025
. .
{using electrical heating means (F24F 6/105 takes precedence)} [2013-01]
F24F 6/04
. .
using stationary unheated wet elements [2013-01]
F24F 6/043
. . .
{with self-sucking action, e.g. wicks (humidificators for radiators F24D 19/008)} [2013-01]
F24F 2006/046
. . .
{with a water pump} [2013-01]
F24F 6/06
. .
using moving unheated wet elements [2013-01]
F24F 2006/065
. . .
{using slowly rotating discs for evaporation} [2013-01]
F24F 6/08
. .
using heated wet elements [2013-01]
F24F 6/10
. . .
heated electrically [2013-01]
F24F 6/105
. . . .
{using the heat of lamps} [2013-01]
F24F 6/12
.
by forming water dispersions in the air [2013-01]
F24F 6/14
. .
using nozzles [2018-08]
F24F 2006/143
. . .
{using pressurised air for spraying} [2013-01]
F24F 2006/146
. . .
{using pressurised water for spraying} [2013-01]
F24F 6/16
. .
using rotating elements [2013-01]
F24F 6/18
.
by injection of steam into the air [2013-01]
F24F 7/00
Ventilation {, e.g. by means of wall-ducts or systems using window or roof apertures} [2018-01]
F24F 2007/001
.
{with exhausting air ducts} [2013-01]
F24F 2007/002
. .
{Junction box, e.g. for ducts from kitchen, toilet or bathroom} [2013-01]
F24F 2007/003
.
{using vent ports in a wall} [2013-01]
F24F 2007/004
.
{Natural ventilation using convection} [2013-01]
F24F 2007/005
.
{Cyclic ventilation, e.g. alternating air supply volume or reversing flow direction (F24F 2012/008 takes precedence when there is heat exchange between exhaust and supply air)} [2013-01]
F24F 7/007
.
with forced flow (using ducting systems F24F 7/06) [2018-08]
WARNING

F24F 7/013
. .
using wall or window fans, displacing air through the wall or window [2018-08]
WARNING

  • Group F24F 7/013 is incomplete pending reclassification of documents from group F24F 13/08.
    Group F24F 7/013 is also impacted by reclassification into groups F24F 7/02 and F24F 7/025.
    All groups listed in this Warning should be considered in order to perform a complete search.
F24F 7/02
.
Roof ventilation (ventilation of roof coverings E04D) [2018-08]
WARNING

F24F 7/025
. .
{with forced air circulation by means of a built-in ventilator} [2018-08]
WARNING

F24F 7/04
.
with ducting systems {also by double walls; with natural circulation (F24F 7/02 takes precedence)} [2013-01]
F24F 7/06
. .
with forced air circulation, e.g. by fan {positioning of a ventilator in or against a conduit} [2018-08]
F24F 7/065
. . .
{fan combined with single duct; mounting arrangements of a fan in a duct} [2018-08]
F24F 7/08
. . .
with separate ducts for supplied and exhausted air {with provisions for reversal of the input and output systems} [2013-01]
F24F 7/10
. . .
with air supply, or exhaust, through perforated wall, floor or ceiling (outlet members for directing or distributing air {into rooms or spaces, e.g. ceiling air-diffusers } F24F 13/06) [2018-08]
F24F 9/00
Use of air currents for screening, e.g. air curtains [2018-01]
F24F 2009/002
.
{Room dividers} [2013-01]
F24F 2009/005
.
{combined with a door} [2013-01]
F24F 2009/007
.
{using more than one jet or band in the air curtain} [2013-01]
F24F 11/00
Control or safety arrangements [2018-01]
NOTE

F24F 11/0001
.
{for ventilation (F24F 11/30 takes precedence)} [2018-01]
F24F 2011/0002
. .
{for admittance of outside air} [2013-01]
F24F 2011/0004
. . .
{to create overpressure in a room} [2013-01]
F24F 2011/0005
. . .
{to create underpressure in a room, keeping contamination inside} [2013-01]
F24F 2011/0006
. .
{using low temperature external supply air to assist cooling} [2013-01]
F24F 11/0008
.
{for air-humidification (F24F 11/30 takes precedence)} [2018-01]
F24F 11/30
.
for purposes related to the operation of the system, e.g. for safety or monitoring [2018-01]
WARNINGS

F24F 11/32
. .
Responding to malfunctions or emergencies [2018-01]
F24F 11/33
. . .
to fire, excessive heat or smoke [2018-01]
F24F 11/34
. . . .
by opening air passages [2018-01]
F24F 11/35
. . . .
by closing air passages [2018-01]
F24F 11/36
. . .
to leakage of heat-exchange fluid [2018-01]
F24F 11/37
. . .
Resuming operation, e.g. after power outages; Emergency starting [2018-01]
F24F 11/38
. . .
Failure diagnosis [2018-01]
F24F 11/39
. . .
Monitoring filter performance [2018-01]
F24F 11/41
. .
Defrosting; Preventing freezing [2018-01]
F24F 11/42
. . .
of outdoor units [2018-01]
F24F 11/43
. . .
of indoor units [2018-01]
F24F 11/46
. .
Improving electric energy efficiency or saving [2018-01]
F24F 11/47
. . .
Responding to energy costs [2018-01]
F24F 11/48
. .
prior to normal operation, e.g. pre-heating or pre-cooling [2018-01]
F24F 11/49
. .
ensuring correct operation, e.g. by trial operation or configuration checks [2018-01]
F24F 11/50
.
characterised by user interfaces or communication [2018-01]
WARNING

F24F 11/52
. .
Indication arrangements, e.g. displays [2018-01]
F24F 11/523
. . .
for displaying temperature data [2018-01]
F24F 11/526
. . .
giving audible indications [2018-01]
F24F 11/54
. .
using one central controller connected to several sub-controllers [2018-01]
F24F 11/56
. .
Remote control [2018-01]
F24F 11/57
. . .
using telephone networks [2018-01]
F24F 11/58
. . .
using Internet communication [2018-01]
F24F 11/59
. . .
for presetting [2018-01]
F24F 11/61
. .
using timers [2018-01]
F24F 11/62
.
characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values [2018-01]
WARNING

F24F 11/63
. .
Electronic processing [2018-01]
F24F 11/64
. . .
using pre-stored data [2018-01]
F24F 11/65
. . .
for selecting an operating mode [2018-01]
WARNING

  • Group F24F 11/65 is incomplete pending reclassification of documents from group F24F 11/30.
    Group F24F 11/65 is also impacted by reclassification into group F24F 11/67.
    All groups listed in this Warning should be considered in order to perform a complete search.
F24F 11/66
. . . .
Sleep mode [2018-01]
F24F 11/67
. . . .
Switching between heating and cooling modes [2018-01]
WARNING

F24F 11/70
.
Control systems characterised by their outputs; Constructional details thereof [2018-01]
WARNING

F24F 11/72
. .
for controlling the supply of treated air, e.g. its pressure [2018-01]
F24F 11/74
. . .
for controlling air flow rate or air velocity [2018-01]
WARNING

  • Group F24F 11/74 is incomplete pending reclassification of documents from group F24F 11/30 and F24F 11/70.
    Group F24F 11/74 is also impacted by reclassification into group F24F 11/755.
    All groups listed in this warning should be considered in order to perform a complete search
F24F 11/745
. . . .
{the air flow rate increasing with an increase of air-current or wind pressure} [2018-01]
F24F 11/75
. . . .
for maintaining constant air flow rate or air velocity [2018-01]
F24F 11/755
. . . .
for cyclical variation of air flow rate or air velocity [2018-01]
WARNING

F24F 11/76
. . . .
by means responsive to temperature, e.g. bimetal springs [2018-01]
F24F 11/77
. . . .
by controlling the speed of ventilators [2018-01]
F24F 11/79
. . .
for controlling the direction of the supplied air [2018-01]
F24F 11/80
. .
for controlling the temperature of the supplied air [2018-01]
WARNING

F24F 11/81
. . .
by controlling the air supply to heat-exchangers or bypass channels [2018-01]
F24F 11/83
. . .
by controlling the supply of heat-exchange fluids to heat-exchangers [2018-08]
WARNING

F24F 11/84
. . . .
using valves [2018-08]
WARNING

F24F 11/85
. . . .
using variable-flow pumps [2018-08]
WARNING

F24F 11/86
. . .
by controlling compressors within refrigeration or heat pump circuits [2018-01]
F24F 11/87
. . .
by controlling absorption or discharge of heat in outdoor units [2018-01]
F24F 11/871
. . . .
by controlling outdoor fans [2018-01]
F24F 11/873
. . .
by controlling refrigerant heaters [2018-01]
F24F 11/875
. . .
by controlling heat-storage apparatus [2018-01]
F24F 11/88
.
Electrical aspects, e.g. circuits [2018-01]
WARNING

F24F 11/89
.
Arrangement or mounting of control or safety devices [2018-01]
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 F24F 3/147) [2018-08]
F24F 12/001
.
{with heat-exchange between supplied and exhausted air} [2013-01]
F24F 12/002
. .
{using an intermediate heat-transfer fluid} [2013-01]
F24F 12/003
. . .
{using a heat pump} [2013-01]
F24F 2012/005
. . .
{using heat pipes} [2013-01]
F24F 12/006
. .
{using an air-to-air heat exchanger (F24F 12/002 takes precedence)} [2017-05]
F24F 2012/007
. .
{using a by-pass for bypassing the heat-exchanger} [2013-01]
F24F 2012/008
. .
{cyclic routing supply and exhaust air (F24F 2007/005 takes precedence when there is no heat exchange)} [2013-01]
F24F 13/00
Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening [2013-01]
F24F 13/02
.
Ducting arrangements [2013-01]
F24F 13/0209
. .
{characterised by their connecting means, e.g. flanges} [2016-11]
F24F 13/0218
. .
{Flexible soft ducts, e.g. ducts made of permeable textiles} [2013-01]
F24F 13/0227
. .
{using parts of the building, e.g. air ducts inside the floor, walls or ceiling of a building (air ducts or channels of buildings E04F 17/04)} [2013-01]
F24F 13/0236
. .
{with ducts including air distributors, e.g. air collecting boxes with at least three openings} [2013-01]
F24F 13/0245
. .
{Manufacturing or assembly of air ducts; Methods therefor} [2013-01]
F24F 13/0254
. .
{characterised by their mounting means, e.g. supports} [2013-01]
F24F 13/0263
. .
{Insulation for air ducts} [2013-01]
F24F 13/0272
. .
{Modules for easy installation or transport} [2013-01]
F24F 13/0281
. .
{Multilayer duct} [2013-01]
F24F 13/029
. .
{Duct comprising an opening for inspection, e.g. manhole} [2013-01]
F24F 13/04
. .
Air-mixing units (F24F 13/06 takes precedence {; room units for the mixing of pre-treated primary air with recirculated or room air F24F 1/00}) [2018-08]
F24F 13/06
. .
Outlets for directing or distributing air into rooms or spaces, e.g. ceiling air diffuser [2013-01]
F24F 13/0604
. . .
{integrated in or forming part of furniture} [2013-01]
F24F 2013/0608
. . .
{Perforated ducts} [2013-01]
F24F 2013/0612
. . .
{Induction nozzles without swirl means} [2013-01]
F24F 2013/0616
. . .
{Outlets that have intake openings} [2013-01]
F24F 13/062
. . .
having one or more bowls or cones diverging in the flow direction [2018-08]
WARNING

F24F 13/065
. . .
formed as cylindrical or spherical bodies which are rotatable [2018-08]
WARNING

F24F 13/068
. . .
formed as perforated walls, ceilings or floors (F24F 13/078 takes precedence) [2013-01]
F24F 13/072
. . .
of elongated shape, e.g. between ceiling panels [2018-08]
WARNING

F24F 13/075
. . .
having parallel rods or lamellae directing the outflow, e.g. the rods or lamellae being individually adjustable (F24F 13/072 takes precedence) [2013-01]
F24F 13/078
. . .
combined with lighting fixtures [2018-08]
WARNING

F24F 13/08
.
Air-flow control members, e.g. louvres, grilles, flaps or guide plates (F24F 7/013F24F 13/06 take precedence) [2018-08]
WARNING

F24F 13/081
. .
{for guiding air around a curve} [2013-01]
F24F 13/082
. .
{Grilles, registers or guards} [2013-01]
F24F 13/084
. . .
{with mounting arrangements, e.g. snap fasteners for mounting to the wall or duct} [2013-01]
F24F 13/085
. . .
{including an air filter} [2013-01]
F24F 2013/087
. . .
{using inflatable bellows} [2013-01]
F24F 2013/088
. . .
{Air-flow straightener} [2013-01]
F24F 13/10
. .
movable, e.g. dampers [2018-08]
WARNING

F24F 13/105
. . .
{composed of diaphragms or segments} [2018-08]
WARNING

F24F 13/12
. . .
built up of sliding members [2018-08]
WARNING

F24F 13/14
. . .
built up of tilting members, e.g. louvre [2018-08]
WARNING

F24F 13/1406
. . . .
{characterised by sealing means} [2018-08]
WARNING

F24F 13/1413
. . . .
{using more than one tilting member, e.g. with several pivoting blades (F24F 13/15 takes precedence)} [2018-08]
WARNING

F24F 13/142
. . . .
{using pivoting blades with intersecting axles} [2018-08]
WARNING

F24F 13/1426
. . . .
{characterised by actuating means} [2018-08]
WARNING

F24F 2013/1433
. . . . .
{with electric motors} [2018-08]
WARNING

F24F 2013/144
. . . . .
{with thermoactuators} [2018-08]
WARNING

F24F 2013/1446
. . . . .
{with gearings} [2018-08]
WARNING

F24F 2013/1453
. . . . .
{with cables, e.g. bowden cables} [2018-08]
WARNING

F24F 2013/146
. . . . .
{with springs} [2018-08]
WARNING

F24F 2013/1466
. . . . .
{with pneumatic means} [2018-08]
WARNING

F24F 2013/1473
. . . . .
{with cams or levers} [2018-08]
WARNING

F24F 2013/148
. . . . .
{with magnets} [2018-08]
WARNING

F24F 13/1486
. . . .
{characterised by bearings, pivots or hinges} [2018-08]
WARNING

F24F 2013/1493
. . . .
{using an elastic membrane} [2018-08]
WARNING

F24F 13/15
. . . .
with parallel simultaneously tiltable lamellae [2018-08]
WARNING

F24F 13/16
. . .
built up of parallelly-movable plates [2018-08]
WARNING

F24F 13/18
. .
specially adapted for insertion in flat panels, e.g. in door or window-pane [2018-08]
WARNING

  • Group F24F 13/18 is impacted by reclassification into groups F24F 13/10 - F24F 13/16.
    All groups listed in this Warning should be considered in order to perform a complete search.
F24F 13/20
.
Casings or covers [2013-01]
F24F 2013/202
. .
{Mounting a compressor unit therein} [2013-01]
F24F 2013/205
. .
{Mounting a ventilator fan therein} [2013-01]
F24F 2013/207
. .
{with control knobs; Mounting controlling members or control units therein} [2013-01]
F24F 13/22
.
Means for preventing condensation or evacuating condensate {(for refrigerating devices in general F25D 21/14)} [2013-01]
F24F 2013/221
. .
{to avoid the formation of condensate, e.g. dew} [2013-01]
F24F 13/222
. .
{for evacuating condensate} [2013-01]
F24F 13/224
. . .
{in a window-type room air conditioner} [2013-01]
F24F 2013/225
. . .
{by evaporating the condensate in the cooling medium, e.g. in air flow from the condenser} [2013-01]
F24F 2013/227
. . .
{Condensate pipe for drainage of condensate from the evaporator} [2013-01]
F24F 2013/228
. .
{Treatment of condensate, e.g. sterilising} [2013-01]
F24F 13/24
.
Means for preventing or suppressing noise {(in perforated ceilings F24F 7/10)} [2013-01]
F24F 2013/242
. .
{Sound-absorbing material} [2013-01]
F24F 2013/245
. .
{using resonance} [2013-01]
F24F 2013/247
. .
{Active noise-suppression} [2013-01]
F24F 13/26
.
Arrangements for air-circulation by means of induction, e.g. by fluid coupling or thermal effect [2013-01]
F24F 13/28
.
Arrangement or mounting of filters [2013-01]
F24F 13/30
.
Arrangement or mounting of heat-exchangers [2013-01]
F24F 13/32
.
Supports for air-conditioning, air-humidification or ventilation units [2013-01]
Indexing scheme associated with group F24F 11/00, relating to control inputs, e.g. measured or estimated values or parameters [2018-01]
F24F 2110/00
Control inputs relating to air properties [2018-01]
F24F 2110/10
.
Temperature [2018-01]
F24F 2110/12
. .
of the outside air [2018-01]
F24F 2110/20
.
Humidity [2018-01]
F24F 2110/22
. .
of the outside air [2018-01]
F24F 2110/30
.
Velocity [2018-01]
F24F 2110/32
. .
of the outside air [2018-01]
F24F 2110/40
.
Pressure, e.g. wind pressure [2018-01]
WARNING

F24F 2110/50
.
Air quality properties [2018-01]
WARNING

F24F 2110/52
. .
of the outside air [2018-01]
F24F 2110/60
. .
Odour [2018-01]
F24F 2110/62
. .
Tobacco smoke [2018-01]
F24F 2110/64
. .
Airborne particle content [2018-01]
F24F 2110/65
. .
Concentration of specific substances or contaminants [2018-01]
WARNING

F24F 2110/66
. . .
Volatile organic compounds [VOC] [2018-01]
F24F 2110/68
. . .
Radon [2018-01]
F24F 2110/70
. . .
Carbon dioxide [2018-01]
F24F 2110/72
. . .
Carbon monoxide [2018-01]
F24F 2110/74
. . .
Ozone [2018-01]
F24F 2110/76
. . .
Oxygen [2018-01]
F24F 2110/80
. .
Electric charge [2018-01]
F24F 2120/00
Control inputs relating to users or occupants [2018-01]
WARNING

F24F 2120/10
.
Occupancy [2018-01]
F24F 2120/12
. .
Position of occupants [2018-01]
F24F 2120/14
. .
Activity of occupants [2018-01]
F24F 2120/20
.
Feedback from users [2018-01]
F24F 2130/00
Control inputs relating to environmental factors not covered by group F24F 2110/00 [2018-01]
F24F 2130/10
.
Weather information or forecasts [2018-01]
F24F 2130/20
.
Sunlight [2018-01]
F24F 2130/30
.
Artificial light [2018-01]
F24F 2130/40
.
Noise [2018-01]
F24F 2140/00
Control inputs relating to system states [2018-01]
WARNING

F24F 2140/10
.
Pressure [2018-01]
WARNING

F24F 2140/12
. .
Heat-exchange fluid pressure [2018-01]
F24F 2140/20
.
Heat-exchange fluid temperature [2018-01]
F24F 2140/30
.
Condensation of water from cooled air [2018-01]
F24F 2140/40
.
Damper positions, e.g. open or closed [2018-01]
F24F 2140/50
.
Load [2018-01]
F24F 2140/60
.
Energy consumption [2018-01]

F24F 2203/00
Devices or apparatus used for air treatment [2013-01]
F24F 2203/02
.
System or Device comprising a heat pump as a subsystem, e.g. combined with humidification/dehumidification, heating, natural energy or with hybrid system [2013-01]
F24F 2203/021
. .
Compression cycle [2013-01]
F24F 2203/023
. . .
with turbine used for expansion [2013-01]
F24F 2203/025
. . .
with turbine for compression [2013-01]
F24F 2203/026
. .
Absorption - desorption cycle [2013-01]
F24F 2203/028
. . .
using a solid absorbing medium [2013-01]
F24F 2203/10
.
Rotary wheel [2013-01]
F24F 2203/1004
. .
Bearings or driving means [2013-01]
F24F 2203/1008
. .
comprising a by-pass channel [2013-01]
F24F 2203/1012
. .
Details of the casing or cover [2013-01]
F24F 2203/1016
. .
combined with another type of cooling principle, e.g. compression cycle [2013-01]
F24F 2203/102
. .
combined with a heat pipe [2013-01]
F24F 2203/1024
. .
combined with a humidifier [2013-01]
F24F 2203/1028
. .
combined with a spraying device [2013-01]
F24F 2203/1032
. .
Desiccant wheel [2013-01]
F24F 2203/1036
. . .
Details [2013-01]
F24F 2203/104
. .
Heat exchanger wheel [2013-01]
F24F 2203/1044
. .
performing other movements, e.g. sliding [2013-01]
F24F 2203/1048
. .
Geometric details [2013-01]
F24F 2203/1052
. .
comprising a non-axial air flow [2013-01]
F24F 2203/1056
. .
comprising a reheater [2013-01]
F24F 2203/106
. . .
Electrical reheater [2013-01]
F24F 2203/1064
. . .
Gas fired reheater [2013-01]
F24F 2203/1068
. .
comprising one rotor [2013-01]
F24F 2203/1072
. .
comprising two rotors [2013-01]
F24F 2203/1076
. .
comprising three rotors [2013-01]
F24F 2203/108
. .
comprising rotor parts shaped in sector form [2013-01]
F24F 2203/1084
. .
comprising two flow rotor segments [2013-01]
F24F 2203/1088
. .
comprising three flow rotor segments [2013-01]
F24F 2203/1092
. .
comprising four flow rotor segments [2013-01]
F24F 2203/1096
. .
comprising sealing means [2013-01]
F24F 2203/12
.
Dehumidifying or humidifying belt type [2013-01]
Air-conditioning [2013-01]
F24F 2221/00
Details or features not otherwise provided for [2013-01]
F24F 2221/02
.
combined with lighting fixtures [2013-01]
F24F 2221/08
.
Installation or apparatus for use in sport halls, e.g. swimming pools, ice rings [2013-01]
F24F 2221/10
.
combined with, or integrated in, furniture [2013-01]
F24F 2221/12
.
transportable [2013-01]
F24F 2221/125
. .
mounted on wheels [2013-01]
F24F 2221/14
.
mounted on the ceiling [2013-01]
F24F 2221/16
.
mounted on the roof [2013-01]
F24F 2221/17
.
mounted in a wall [2013-01]
F24F 2221/18
.
combined with domestic apparatus [2013-01]
F24F 2221/183
. .
combined with a hot-water boiler [2013-01]
F24F 2221/186
. .
combined with a fireplace [2013-01]
F24F 2221/20
.
mounted in or close to a window [2013-01]
F24F 2221/22
.
Cleaning ducts or apparatus [2013-01]
F24F 2221/225
. .
using a liquid [2013-01]
F24F 2221/26
.
improving the aesthetic appearance [2013-01]
F24F 2221/28
.
using the Coanda effect [2013-01]
F24F 2221/30
.
comprising fireproof material [2013-01]
F24F 2221/32
.
preventing human errors during the installation, use or maintenance, e.g. goofy proof [2013-01]
F24F 2221/34
.
Heater, e.g. gas burner, electric air heater [2013-01]
F24F 2221/36
.
Modules, e.g. for an easy mounting or transport [2013-01]
F24F 2221/38
.
Personalised air distribution [2013-01]
F24F 2221/40
.
HVAC with raised floors [2013-01]
F24F 2221/42
.
Mobile autonomous air conditioner, e.g. robots [2013-01]
F24F 2221/44
.
Protection from terrorism or theft [2013-01]
F24F 2221/46
.
Air flow forming a vortex [2013-01]
F24F 2221/48
.
HVAC for a wine cellar [2013-01]
F24F 2221/50
.
HVAC for high buildings, e.g. thermal or pressure differences [2013-01]
F24F 2221/52
.
Weather protecting means, e.g. against wind, rain or snow [2013-01]
F24F 2221/54
.
Heating and cooling, simultaneously or alternatively [2013-01]
F24F 2221/56
.
Cooling being a secondary aspect [2013-01]