.~ Having flexible, cooled, or air curtain seal between rotary and stationary parts
(under subclass 103) Apparatus having a stationary member and a rotary drum and including a means preventing or controlling dilution or escape of the drum atmosphere of their junction, the means being a flexible or cooler seal or an air curtain type flow controller.
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64, for a fluid curtain at a work chamber port or work path.
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277, Seal for a Joint or Juncture, for a generic sealing means or process, cross-reference art collection 903 seal for a rotating kiln or drum or cross-reference art collection 930 for a seal including a heating or cooling feature.
285, Pipe Joints or Couplings, appropriate subclass for a seal, per se, for a tubular structure.