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| SECTION F– MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING |
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| F 28 | HEAT EXCHANGE IN GENERAL (arrangement or mounting of heat-exchangers in air-conditioning, air-humidification or ventilation F 24 F 13/30) |
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| Notes |
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| (1) | In this class, the following expressions are used with the meanings indicated: |
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| – | "heat exchange" means the heating or cooling of a fluid or fluent solid by direct or indirect contact with a heated or cooled fluid or fluent solid; |
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| – | "heat transfer" means the heating or cooling of a fluid or fluent solid by direct contact with a heated or cooled surface or body. |
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| (2) | Apparatus using heat exchange or heat transfer (as defined in Note (1) above) for specific purposes is classified either in subclass F 28 B or in the appropriate subclasses of, for example, classes F 22, F 24, F 25, F 26, or F 27; if no such other subclass is appropriate, such apparatus is classified in subclass F 28 C or F 28 D. |
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| F 28 B | STEAM OR VAPOUR CONDENSERS (condensation of vapours B 01 D 5/00; condensation during pretreatment of gases prior to electrostatic precipitation of dispersed particles B 03 C 3/014; steam engine plants having condensers F 01 K; liquefaction of gases F 25 J; details of heat-exchange or heat-transfer arrangements of general application F 28 F) |
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| F 28 C | HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA COME INTO DIRECT CONTACT WITHOUT CHEMICAL INTERACTION (safety devices in general F 16 P; fluid heaters having heat generating means F 24 H; with an intermediate heat-transfer medium coming into direct contact with heat-exchange media F 28 D 15/00 to F 28 D 19/00; details of heat-exchange apparatus of general application F 28 F) |
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| F 28 D | HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT (fluid heaters having heat generating means and heat transferring means F 24 H; furnaces F 27; details of heat-exchange apparatus of general application F 28 F) |
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| F 28 F | DETAILS OF HEAT-EXCHANGE OR HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION (water or air traps, air venting F 16) |
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| F 28 G | CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OF BOILERS (cleaning pipes or tubes in general B 08 B 9/02; devices or arrangements for removing water, minerals, or sludge from boilers while the boiler is in operation, or which remain in position while the boiler is in operation, or are specifically adapted to boilers without any other utility F 22 B 37/48; removal or treatment of combustion products or combustion residues F 23 J; removing ice from heat-exchange apparatus F 28 F 17/00) |
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