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.

Note(s) [5]

• 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.

Note(s) [3]

• 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 or the treatment of air in rooms or spaces by means of cooling or a combination of cooling and a further kind of air treatment, e.g. humidification, heating or air purification;
  • "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.

Note(s) [3]

• The distinguishing feature of the air heaters covered by this subclass is that the heat is predominantly released to the air by convection, mostly by forced circulation of the air. The domestic stoves or ranges covered by subclass F24B, F24C may also be fired or electric air heaters but they release their heat to a considerable extent by radiation and only to some extent by natural convention.
• In this subclass, the following terms or expressions are used with the meanings indicated:
  • "water" includes other liquids and means always the liquid to be heated;
  • "air" includes other gases or gas mixtures and means always the gas to be heated;
  • "furnace tubes" means tubes inside the heater wherein combustion is performed;
  • "fire tubes" means tubes inside the heater through which flue-gases flow from a combustion chamber located outside the tubes;
  • "heater" means apparatus including both heat generating means and means for transferring the generated heat to water or air.
• All storage heaters are classified in group F24H 7/00.