CPC Main Group Additional Only
F23J 2211/00 Flue gas duct systems
4 direct subcodes
Child Classifications
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- F23J 2211/10 Balanced flues (combining air supply and flue gas exhaust)
- F23J 2211/20 Common flues for several combustion devices
- F23J 2211/30 Chimney or flue associated with building ventilation system
- F23J 2211/40 Chimney with internal flue pipe system