.~ Of cooling, dilution, withdrawal, bypass or circulation of work chamber atmosphere
(under subclass 36) Apparatus in which (1) in the feeding of inert or treating fluid is controlled or (2) the cooling, dilution, withdrawal, return, mixing, by-pass, circulation or recirculation of work chamber gas in or from a work chamber is controlled.
SEE OR SEARCH CLASS
34, Drying and Gas or Vapor Contact With Solids,
565, for the automatic control of the flow of a treating gas or vapor in a drier or in a residual gas-solid contact device.