4.2 Nomenclature for penetrations
Firestop systems are identified in this category by an alphanumeric identification system . The first alpha component identifies the type of assembly being penetrated i . e . walls , floors or both . The second alpha component identifies the material of assembly being penetrated and the numeric component identifies the type of penetrating item in a sequential format .
C - AJ - 1 194
Combination – Floor or Wall F = Floors W = Walls C = Walls and Floors
Individual System Number
Penetrant Type
Construction Type of Floor or Wall
Second letter ( s ) provide more info on wall / floor :
• A : Concrete floors ≤ 5 inches thick
• B : Concrete floors > 5 inches
• C : Framed floors – floor / ceiling assemblies
• D : Steel deck construction
• J : Concrete or masonry walls ≤ 8 inches thick
• K : Concrete or masonry walls > 8 inches thick
• L : Framed walls – gypsum wallboard assemblies
1 st digit describes the penetrating item ( s ):
• 0 : Blank openings
• 1 : Metal Pipe , conduit , or tubing
• 2 : Non-metallic pipe , conduit or tubing
• 3 : Cables
• 4 : Cable trays
• 5 : Insulated pipes
• 6 : Miscellaneous electrical ( busways )
• 7 : Miscellaneous mechanical ( ductwork )
• 8 : Groupings of penetrations , including any combination of items listed above
Inspection Guidebook 10 / 28