Steel Duct

Penetration Item (Size and Type)

Sleeve
O = Optional
R = Required

Point Contact

Assembly Thickness

F Rating

Nelson Product

UL System

Nelson FS Drawing

4" diameter" 30 GA    X 3¾,5 1,2 LBS3 W-L-7106 FS-0611
6" diameter 28 GA or 20" diameter 22 GA.    X 3¾,5 1,2 ES1399 W-L-7106 FS-0466
20" diameter 28 GA (Insulated-Fiberglass)    X 3¾,5 1,2 WRS3/ES1399 W-L-7126 FS-0650