CPC Main Group F23N 1/00 Regulating fuel supply 7 direct subcodes Child Classifications Navigate with arrow keys, Enter to open F23N 1/002 F23N 1/005 F23N 1/007 F23N 1/02 conjointly with air supply F23N 1/04 conjointly with air supply and with draught F23N 1/06 conjointly with draught F23N 1/08 conjointly with another medium, e.g. boiler water