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