Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements or dispositions of combustion apparatus

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• F22B 31/0007
• F22B 31/02 Installation of water-tube boilers in chimneys, e.g. in converter chimneys
• F22B 31/04 Heat supply by installation of two or more combustion apparatus, e.g. of separate combustion apparatus for the boiler and the superheater respectively
• F22B 31/08 Installation of heat-exchange apparatus or of means in boilers for heating air supplied for combustion