(under subclass 351) Apparatus comprising a separating media which is advanced into the gas stream without regard to leading or trailing ends or is fed from or to a roll or wound package, usually outside of the gas flow path.
(1) Note. All these members are generally of sheet form and of nonrigid quality so that they may be distorted or caused to change shape under normal usage.
(2) Note. A continuous media (i.e. one which is drum type or has no free ends) is not classified in this subclass, but is found in subclass 351.
SEE OR SEARCH THIS CLASS, SUBCLASS:
497+, and 500, for sheet form filters which are maintained in nonplanar form, similar to the arrangements of many of the sheet form separators in this subclass.
SEE OR SEARCH CLASS
242, Winding, Tensioning, or Guiding, 550+, for unwinding an elongated material and subclasses 570+ for a coil holder of general use.
