System No. W-L-3111 provides a firestop penetration assembly rated for one and two hours with a zero-hour T rating. The installation accommodates penetrating items passing through a wall assembly. Section A-A details the internal component layout and clearances.
System No. W-L-3111 F Ratings - 1 and 2 Hr A A SECTION A-A 1 3 T Rating - 0 Hr 2 4
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