CPC Main Group
F26B 23/00 Heating arrangements (using heated air or other gases F26B21/00)
4 direct subcodes
Child Classifications
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- F26B 23/02 using combustion heating ( F26B23/10 take precedence)
- F26B 23/04 using electric heating (F26B23/10 takes precedence)
- F26B 23/10 using tubes or passages containing heated fluids