USG Cavity Shaft Wall Systems
Penetration Fire Tests
To maintain the integrity of the shaft wall, most services that interrupt the wall must
have additional protection against fire. Call-button and floor-indicator penetrations
occur in every elevator shaft wall. Boxes for these services usually penetrate the wall
and invalidate the fire rating unless supplementary fire protection is added. Details
included here successfully achieved a 2-hour fire endurance when tested according to ASTM
E119 fire exposure.
Electrical Box: Box size should be
compatible with C-H stud size selected (4" studs typically required) per Test CEG
6-15-79.
Fire Damper: 1-1/2 hour per Test UL R13479.
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