Understanding
the UL Fire Resistance Directories
òNUMBERING SYSTEM FOR FIRE RATED ASSEMBLIES
òTYPES OF PROTECTION
òDirect Applied Protection
òFloors-Ceilings A,B*,or
C*ááááááááááááá Concrete and Cellular Steel Floor
òD, E* or F*ááááááááááááááááááááááááááááááááááááááááááááá Concrete and Steel Floor Units
òG, H*, or I*áááááááááááááááááááááááááááá Concrete and Steel Joists
òJ or Kááááááááááááááááááááááááááááááááááááá Concrete
òL or M* Wood Joist orááááááááááááá Combination Wood and Steel Assemblies
òBatts & Blankets or Mineralá and Fiber Boards
òBeams:ááááááááááááááááááááááááááááááááááááááááááááááááá
N or O* for Floor-Ceiling
òRoof-Ceiling:ááááááááááááááááááááááááááááááááááááááá P, Q* or R*
òBeams:ááááááááááááááááááááááááááááááááááááááááááááááááááá
S or T* Roof-Ceiling
òMetal Panels Gypsum Bd. Lath and/or Plaster
òMetal Stud Gypsum
Bd. Lath and/or Plaster
òWood Stud Gypsum Bd. Lath and/or Plaster
òBldg. or Partition
Panelá Units
òWall & Partition:áááááááááááááááááááááááááááááááááá U, V or W*
òBatts & Blankets or Mineral & Fiber Boards
òThe prefix numbers with an
asterisk (*) and the design numbers indicated as "Reserved" in the
above table are for future
expansion and to cater to new types of systems