(under the class definition) Apparatus having a device to render the heating apparatus or parts thereof free from undesirable material.
(1) Note. Cleaning means for this subclass requires the installation of additional means or connections to treat the apparatus, not the material being handled, or the manipulation of the system in some special way to secure the cleaning effect.
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2, for a process of heater operation including a step of apparatus purging, cleaning or accretion preventing.
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34, Drying and Gas or Vapor Contact With Solids,
85, for a drier including structure for cleaning the drier. 431, Combustion,
121, for a residual combustion device including an apparatus cleaner.