(under subclass 36) Apparatus in which the control is of means dislodging, removing, collecting or flushing out a material undesirable at all times or at a particular time of operation.
SEE OR SEARCH THIS CLASS, SUBCLASS:
2, for a process including cleaning, purging or preventing undesirable accretion in a heating apparatus.
SEE OR SEARCH CLASS
431, Combustion,
29+, for a combustion device not having material heating features including a means automatically controlling a purging or scavenging arrangement.
