Secondary Enclosure : An enclosure or guard constructed around but separate from a dipping or coating process whose purpose is other than for fire protection, confinement of a possible fire, or confinement of vapor or mists
NFPA 34 Standard for Dipping and Coating Processes Using Flammable or Combustible Liquids, 2007 ed. http://www.nfpa.org/assets/files/AboutTheCodes/34/ Errata34-07-1.pdf, (Std: Dipping and Coat Procss Using Flam&Comb Liqd - Amer) {198 NFC}